Diagnostic systems and methods

ABSTRACT

A diagnostic system is configured to perform first and second, different nucleic acid amplification reactions. The system includes a bulk reagent container compartment configured to store first bulk reagent container containing a first bulk reagent for performing sample preparation processes with a first subset and a second subset of a plurality of samples and a second bulk reagent container containing a second bulk reagent for performing the first nucleic acid amplification reaction. The system includes a unit-dose reagent compartment storing a unit-dose reagent pack including unit-dose reagents for performing the second nucleic acid amplification reaction. The system is configured to perform the sample preparation process using the first bulk reagent on the first and second subsets of the samples, perform the first nucleic acid amplification reaction using the second bulk reagent on the first subset of the samples, and perform the second nucleic acid amplification reaction using the unit-dose reagents on the second subset of the samples.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No. 16/829,230, filed Mar. 25, 2020, now U.S. Pat. No. 10,889,851, which is a continuation of U.S. application Ser. No. 15/675,206, filed Aug. 11, 2017, now U.S. Pat. No. 10,711,297, which is a continuation of U.S. application Ser. No. 14/213,900, filed Mar. 14, 2014, now U.S. Pat. No. 9,732,374, which claims the benefit of U.S. Provisional Application No. 61/784,994, filed Mar. 14, 2013, the contents of each application are hereby incorporated by reference herein.

FIELD

The present disclosure relates to diagnostic systems and methods for performing a plurality of different molecular assays on a plurality of samples and, particularly, molecular assays that comprise target nucleic acid amplification reactions.

BACKGROUND

None of the references described or referred to herein are admitted to be prior art to the claimed invention.

Molecular assays are nucleic acid-based tests that are used in clinical diagnosis, screening, monitoring, industrial and environmental testing, health science research, and other applications to detect the presence or amount of an analyte of interest in a sample, such as a microbe or virus, or to detect genetic abnormalities or mutations in an organism. Molecular assays enabling quantification may permit practitioners to better calculate the extent of infection or disease and to determine the state of a disease over time. Quantitative molecular assays are also useful for monitoring the effectiveness of a therapy. A variety of known molecular assays can be employed to detect various diagnostic indicators.

Molecular assays generally include multiple steps leading to the detection or quantification of a target nucleic acid in a sample. Targeted nucleic acids often include a region that is specific to an identifiable “group” of organisms or viruses, where the group is defined by at least one shared sequence of nucleic acid that is common to all members of the group and is specific to the group in the particular sample being assayed. Examples of nucleic acid-based detection methods are disclosed by Kohne in U.S. Pat. No. 4,851,330 and Hogan et al. in U.S. Pat. No. 5,541,308.

Most molecular assays include a detection step in which the sample is exposed to a detection probe or amplification primer that is designed or selected to exhibit specificity under the particular conditions of use for a nucleic acid sequence belonging to an organism or virus of interest. The detection probe or amplification primer can be labeled for detection with a reporter moiety, such as a chemiluminescent or fluorescent agent, or an intercalating dye can be used to indiscriminately detect the presence of double-stranded nucleic acids in a sample. See, e.g., Livak et al. in U.S. Pat. No. 5,538,848, Hogan et al. in U.S. Pat. No. 5,541,308, Tyagi et al. in U.S. Pat. No. 5,925,517, Higuchi in U.S. Pat. No. 5,994,056, Wittwer et al. in U.S. Pat. No. 6,174,670, Whitcombe et al. in U.S. Pat. No. 6,326,145, and Wittwer et al. in U.S Pat. No. 6,569,627. To render a nucleic acid available for hybridization to the detection probe or amplification primer, cells may be lysed or permeabilized by a variety of known techniques, including by chemical (e.g., detergent), mechanical (e.g., sonication), and/or thermal procedures. See, e.g., Clark et al. in U.S. Pat. No. 5,786,208.

Before or after exposing a target nucleic acid to a detection probe or amplification primer, the target nucleic acid can be immobilized on a solid support (e.g., particles or beads comprising a magnetically-responsive material) that directly or indirectly binds the target nucleic acid. A solid-phase extraction method for directly binding nucleic acids onto silica beads in the presence of a chaotropic substance is described by Boom et al. in U.S. Pat. No. 5,234,864. An example of indirect immobilization is described Weisburg et al. in U.S. Pat. No. 6,534,273, which discloses the use of a capture probe that binds to the target nucleic acid under a first set of sample conditions and to an oligonucleotide covalently attached to the solid support under a second set of sample conditions. If the solid support comprises a magnetically-responsive particle or bead, magnets can be used to attract the solid support to the side of a receptacle containing the solid support. Once the immobilized target nucleic acid is isolated within the receptacle, the isolated target nucleic acid can be separated from at least a portion of the fluid contents of the sample by, for example, contacting and aspirating the fluid contents of the receptacle with a robotic pipettor or other substance transfer device. See, e g , Ammann et al. in U.S. Pat. No. 6,605,213. One or more wash steps with a buffered solution or water may be performed to further purify the isolated nucleic acid.

To increase the sensitivity of an assay, a target nucleic acid can be amplified by a nucleic acid amplification reaction, many of which are well known in the art. Known methods of amplification include Polymerase Chain Reaction (“PCR”) (see, e.g., Mullis et al. in U.S. Pat. Nos. 4,683,195, 4,683,202 and 4,800,159; and Mullis et al., Methods in Enzymology, 155:335-350 (1987)); Strand Displacement Amplification (“SDA”) (see, e.g., Walker, PCR Methods and Applications, 3:25-30 (1993); Walker et al., Nucleic Acids Res., 20:1691-1996 (1992); and Walker et al., Proc. Natl. Acad. Sci., 89:392-396 (1991)); Ligase Chain Reaction (“LCR”) (see, e.g., Birkenmeyer in U.S. Pat. No. 5,427,930 and Carrino et al., in U.S. Pat. No. 5,686,272); and transcription-based methods of amplification (Boothroyd et al. in U.S. Pat. No. 5,437,990; Kacian et al., in U.S. Pat. Nos. 5,399,491 and 5,480,784; Davey et al. in U.S. Pat. No. 5,409,818; Malek et al. in U.S. Pat. No. 5,130,238; and Gingeras et al. in International Publication Nos. WO 88/01302 and WO 88/10315). A review of many amplification reactions, including PCR and Transcription-Mediated Amplification (“TMA”), is provided in Lee et al., Nucleic Acid Amplification Technologies, BioTechniques Books (1997).

PCR is the oldest and most common form of amplification. Like other amplification methods, PCR amplifies one or more copies of a region of nucleic acid by several orders of magnitude, generating thousands to millions of copies of a particular nucleic acid sequence. PCR has broad applications in clinical and biological research labs. The uses of this procedure are too enumerable, and well known at this time, to recite in this patent application.

PCR employs thermal cycling, which consists of repeated cycles of heating and cooling of a reaction mixture. The reaction is generally initiated with primers (short DNA fragments containing sequences complementary to the target nucleic acid region), along with enzymes and additional reaction materials. Once under way, the replicated nucleic acid can be used as an additional template in the amplification reaction, thereby leading to the exponential amplification of a target nucleic acid sequence.

Because a probe hybridizes to the targeted sequence, the strength of a signal associated with the probe is proportional to the amount of target nucleic acid sequence that is present in a sample. Accordingly, by periodically measuring, during the amplification process, a signal indicative of the presence of amplicon, the growth of amplicon over time can be detected. Based on the data collected during this “real-time” monitoring of the amplification process, the amount of the target nucleic acid that was originally in the sample can be ascertained. In one context, collecting data in “real-time” means collecting data while a reaction or other process is in progress, as opposed to collecting data at the conclusion of the reaction or process. Systems and methods for real-time detection and for processing real-time data to ascertain nucleic acid levels are disclosed by, for example, Lair et al. in U.S. Pat. No. 7,932,081.

To detect different nucleic acids in a single assay, distinct probes may be designed or selected to separately hybridize to the different nucleic acids, where the probes may include reporter moieties that can be differentiated from each other. See, e.g., Livak et al. in U.S. Pat. No. 5,538,848, Tyagi et al. in U.S. Pat. No. 5,925,517, Morrison in U.S. Pat. No. 5,928,862, Mayrand in U.S. Pat. No. 5,691,146, and Becker et al. in U.S. Pat. No. 5,928,862. For example, different probes designed or selected to hybridize to different targets can have fluorophores that fluoresce at a predetermined wavelength when exposed to excitation light of a prescribed excitation wavelength. Assays for detecting different target nucleic acids can be performed in parallel by alternately exposing the sample material to different excitation wavelengths and detecting the level of fluorescence at the wavelength of interest corresponding to the probe for each target nucleic acid during the real-time monitoring process. Parallel processing can be performed using different signal detecting devices configured to periodically measure signal emissions during the amplification process, and with different signal detecting devices being configured to generate excitation signals of different wavelengths and to measure emission signals of different wavelengths.

SUMMARY

Aspects of the present disclosure are embodied in systems, apparatuses, and processes that, inter alia, enhance the functionality of certain diagnostic first modules by supporting processing capabilities that are not available in the base first module or existing modules within the base first module. In one embodiment, the systems, apparatuses, and processes extend the functionality of a nucleic acid diagnostic first module by supporting PCR assay processing and analysis capabilities in addition to isothermal amplification processing and analysis capabilities. A second module is operatively coupled to the base first module to extend the overall system capabilities of the diagnostic system. Providing this extension module imparts sample-to-answer capabilities for a single automated instrument that, when incorporated, will be capable of automatically performing both thermal cycling and isothermal amplification assays, and which may incorporate end-point and real-time formats using chemiluminescent and/or fluorescent labels.

In some embodiments, a diagnostic system can be configured to perform a first nucleic acid amplification reaction and a second nucleic acid amplification reaction different than the first nucleic acid amplification reaction. The diagnostic system comprises at least one bulk reagent container compartment configured to store at least a first bulk reagent container comprising a first bulk reagent for performing a sample preparation process, and a second bulk reagent container comprising a second bulk reagent for performing the first nucleic acid amplification reaction. The at least one bulk reagent container compartment is further configured to store a unit-dose reagent compartment configured to store at least one unit-dose reagent pack comprising a plurality of unit-dose reagents for performing the second nucleic acid amplification reaction. The diagnostic system is configured to perform the sample preparation process using the first bulk reagent on a first subset of the plurality of samples provided to the diagnostic system. The diagnostic system is also configured to perform the first nucleic acid amplification reaction using a second bulk reagent on the first subset of the plurality of samples. And the diagnostic system is configured to perform the second nucleic acid amplification reaction using the plurality of unit-dose reagents on a second subset of the plurality of samples.

In some embodiments, an automated method for analyzing a plurality of samples comprises performing a first assay on a first sample subset of the plurality of samples. The first assay comprises a first reaction that uses a first unit-dose reagent. The method also comprises performing a second assay on a second sample subset of the plurality of samples. The second assay comprises a second reaction that uses at least one of (a) a second unit-dose reagent different than the first unit-dose reagent and (b) a first bulk reagent. Performing the first assay and performing the second assay occur within a same diagnostic system that stores the first unit-dose reagent and at least one of the second unit-dose reagent and the first bulk reagent.

In one exemplary embodiment, the base first module comprises a dual format molecular diagnostic instrument designed to run specific target-amplified assays, utilizing chemiluminescence and fluorescence detection technologies for both qualitative and real-time quantitative assays. With the addition of the second module, additional automated assays, such as PCR assays, can be run (intermixed) with assays performed by the base first module and achieve similar throughput that is achieved by the base first module.

In one exemplary embodiment, the second module comprises a thermal cycler with real-time fluorescence detection capabilities, a reagent pack storage bay that allows for loading and cooled storage of new reagent packs containing reagents (e.g., PCR reagents), additional disposable pipette tip trays, PCR- and assay-specific reagents, and one or more pipettor systems to perform the assay steps needed for the PCR or other reaction and/or receptacle transport. The second module may rely on the base first module for sample input, sample preparation, target capture, and other processing steps, such as the addition of elution for subsequent PCR assays, and thus the second module further leverages those capabilities of the base first module and supports additional processing and detection capabilities without requiring that the sample input and preparation functionality be built into the second module.

Aspects of the disclosure are embodied in a second module for enhancing the capabilities of a first module configured to process substances within each of a plurality of receptacles and including a first substance transfer device configured to dispense substances into each receptacle and a receptacle transfer device configured to move receptacles within the first module. The second module is configured to be coupled to or decoupled from the first module and comprises a container transport configured to transport at least one container from a location within the second module to a location within the first module that is accessible to the first substance transfer device to transfer substance from the container to a receptacle within the first module, a receptacle distribution module configured to receive a receptacle from the receptacle transfer device of the first module, transfer the receptacle into the second module, and move the receptacle between different locations within the first module, and a second substance transfer device configured to dispense substances into or remove substances from the receptacle within the second module.

According to some aspects of the disclosure, the receptacle distribution module comprises a receptacle distributor configured to move a receptacle onto the receptacle distributor at a first location on the second module, carry the receptacle from the first location to a second location on the second module that is different from the first location, and move the receptacle off the receptacle distributor at the second location on the second module. A receptacle handoff device can be configured to receive a receptacle from the receptacle transfer device of the first module and to reposition the receptacle to present the receptacle to the receptacle distributor to be moved by the receptacle distributor from the receptacle handoff device onto the receptacle distributor.

According to some aspects of the disclosure, the receptacle distributor is configured to rotate about an axis of rotation to move a receptacle carried thereby in an arced path between locations within the second module. Other configurations for moving a receptacle between locations within the second module are contemplated. Therefore, the disclosure is not limited to receptacle distributors that rotate about an axis of rotation.

According to some aspects of the disclosure, the second module further comprises receptacle storage stations for holding one or more receptacles transferred from the first module to the second module, wherein the receptacle storage stations are arranged in a configuration corresponding to the arced path of the receptacle distributor.

According to some aspects of the disclosure, the receptacle distributor is configured to move vertically a receptacle carried thereby between different vertically-disposed locations within the second module. According to some aspects of the disclosure, the receptacle handoff device is configured to rotate between a first position for receiving a receptacle from the receptacle transfer device of the first module and a second position for presenting the receptacle to the receptacle distributor.

According to some aspects of the disclosure, the second module further comprises a container compartment, configured to hold one or more fluid containers. In certain embodiments, the container compartment can be a container drawer configured to be moved between an opened position and a closed position and to, when moved to the closed position, place at least one fluid container into an operative position with respect to the container transport so that the container can be transported by the container transport from the container compartment into the first module. In an alternate embodiment, the container compartment can comprise a door with a sliding tray that is configured to be moved between an opened position and a closed position and to, when moved to the closed position, place at least one fluid container into an operative position with respect to the container transport so that the container can be transported by the container transport from the container compartment into the first module.

According to some aspects of the disclosure, the second module further comprises a container carriage configured to carry one or more containers and to be movable with the container compartment and further configured to be engaged by the container transport when the container compartment is in the closed position such that the container transport is operable to move the container carriage and the one or more containers carried thereby from the container compartment into the first module.

According to some aspects of the disclosure, the second module further comprises a carriage transport and a carriage lock. The carriage transport is moveable with the container receptacle and configured to carry the container carriage between a first position when the container receptacle is in the opened position and a second position when the container receptacle is in the closed position. The carriage lock is configured to lock the container carriage to the carriage transport when the carriage transport is in the first position and to release the container from the carriage transport when the carriage transport is in the second position to permit the container carriage to be removed from the carriage transport by the container transport.

According to some aspects of the disclosure, the container transport comprises a track extending from the container compartment into the first module, a carriage hook configured to engage the container carriage when the container compartment is in the closed position, and a motorized carriage hook drive system configured to move carriage hook along the carriage track.

According to some aspects of the disclosure, the motorized carriage hook drive system comprises a motor and a belt driven by the motor and coupled to the carriage hook.

According to some aspects of the disclosure, the processing apparatus further comprises one or more position sensors disposed at one or more locations along the track to detect a position of the carriage on the track.

According to some aspects of the disclosure, the second module further comprises a reagent pack changer comprising a pack input device and a pack storage compartment. The pack input device is configured to enable an operator to place a reagent pack containing at least one reagent into the second module or remove a reagent pack from the second module. The pack storage compartment is configured to hold a plurality of reagent packs until a reagent pack is needed for processing within the second module. The receptacle distribution module is further configured to move a reagent pack between the pack input device and the pack storage compartment.

According to some aspects of the disclosure, the second module further comprises one or more reagent pack loading stations, each configured to hold a reagent pack in a manner that permits the second substance transfer device to transfer a substance to or from the reagent pack. Therefore, in some embodiments, the reagent pack loading station is configured to change the orientation of the reagent pack from an initial loaded position to a position aligned with the second substance transfer device.

According to some aspects of the disclosure, the second module further comprises a charged field generator operatively associated with at least one of the pack input device, the pack storage compartment, and the reagent pack loading stations and configured to generate electrostatic forces to position and hold a reagent present in a reagent pack held in the pack input device or pack storage compartment. In related aspects the charged field generator is situated below at least one of the pack input device, the pack storage compartment, and the reagent pack loading stations such that electromagnetic forces are applied to, or adjacent to, the bottom of one or more wells of a reagent pack, when present.

According to some aspects of the disclosure, wherein the pack input device comprises a reagent pack carousel that is rotatable about an axis of rotation, wherein the pack carousel includes a plurality of reagent pack stations, each configured to hold a reagent pack, disposed around the axis of rotation.

According to some aspects of the disclosure, the pack carousel is disposed in a compartment, such as a drawer, that is movable between an open position providing access to the pack carousel and a closed position closing off access to the pack carousel. The pack carousel can also be accessed through an access panel revealing a slidable tray on which is mounted the pack carousel.

According to some aspects of the disclosure, the second module further comprises a code reader operatively disposed with respect to the pack input device and configured to read a machine readable code on each reagent pack carried in the pack input device. In some embodiments, the code reader reads the machine readable code on a respective reagent pack in close proximity to the code reader.

According to some aspects of the disclosure, the second module further comprises a pack storage carousel disposed within the pack storage compartment. The pack storage carousel is rotatable about an axis of rotation and includes a plurality of reagent pack stations, each configured to hold a reagent pack, disposed around the axis of rotation.

According to some aspects of the disclosure, the reagent pack stations of the pack storage carrousel are disposed on more than one level of the second module.

According to some aspects of the disclosure, the second module further includes a cooling system for maintaining the storage compartment at a lower than ambient temperature.

According to some aspects of the disclosure, the second substance transfer device comprises a robotic pipettor having a pipettor probe, and the second module further comprises one or more disposable tip compartments configured to hold a plurality of disposable tips configured to be placed on the pipettor probe of the robotic pipettor.

According to some aspects of the disclosure, the second module further comprises a cap/vial tray configured to hold a plurality of processing vials and/or associated caps. Each cap is configured to be coupled to an associated vial to close the associated vial. The vials are accessible by the robotic pipettor to dispense processing material into the vials, and the associated caps are accessible by the robotic pipettor to move each cap into an associated vial to form a cap/vial assembly. The robotic pipettor is configured to move the cap/vial assembly from the cap/vial tray to another location on the second module.

According to some aspects of the disclosure, the second module further comprises a centrifuge, wherein the robotic pipettor is configured to move a cap/vial assembly from the cap/vial tray to the centrifuge.

According to some aspects of the disclosure, the second module further comprises a thermal cycler configured to hold a plurality of cap/vial assemblies and to subject the contents of the plurality of cap/vial assemblies to cyclically varying temperatures and a robotic vial transfer pipettor configured to move a cap/vial assembly from the centrifuge to the thermal cycler.

According to some aspects of the disclosure, the second module further comprises one or more magnetic receptacle holding slots configured to hold a receptacle transferred from the first module to the second module. Each magnetic receptacle holding slot comprises a magnet and is configured to draw magnetic particles contained within the receptacle to a wall of the receptacle and out of solution within the fluid contents of the receptacle.

According to some aspects of the disclosure, the first module and the second module are configured to conduct nucleic acid amplification reactions.

According to some aspects of the disclosure, the nucleic acid amplification reactions conducted in the first module and the second module are different types of amplification reactions.

According to some aspects of the disclosure, the nucleic acid amplification reaction conducted in the first module comprises a qualitatively monitored reaction and the nucleic acid amplification reaction conducted in the second module comprises a quantitatively monitored reaction.

According to some aspects of the disclosure, the nucleic acid amplification reaction conducted in the second module comprises a reaction monitored in real-time.

According to some aspects of the disclosure, wherein the nucleic acid amplification reaction conducted in the first module is an isothermal reaction, and the nucleic acid amplification reaction conducted in the second module comprises the use of a polymerase chain reaction.

Aspects of the disclosure are further embodied in an automated system capable of performing multiple molecular assays on a single sample. The system comprises a sample input portal configured to accept samples contained in one or more receptacles, a sample preparation module configured to prepare a sample provided to the sample input portal for a nucleic acid amplification reaction, a first module configured to conduct an isothermal nucleic acid amplification assay with the sample, a second module configured to conduct a nucleic acid amplification assay involving temperature cycling with the sample, and a transport mechanism configured to effect automated transport of one or more receptacles containing the sample between the sample input portal, the sample preparation module, the first module, and the second module.

According to some aspects of the disclosure, the automated system further comprises a substance transfer device configured to access the sample when present in the sample second module, the first module, or the second module.

According to some aspects of the disclosure, the system further comprises a reagent storage compartment configured to hold a plurality of reagent containers, wherein the reagent storage compartment is held at a temperature below ambient temperature.

According to some aspects of the disclosure, the system further comprises a reagent container transport mechanism configured to transport one or more reagent containers between the reagent storage compartment and a separate location within the second module.

According to some aspects of the disclosure, the reagent container transport mechanism is configured to transport the reagent containers within the second module and to transport the receptacles within the second module.

Some aspects of the disclosure are embodied in a method for improved thermal cycling of low volume nucleic acid amplification reaction mixtures. The method comprises combining a fluid sample together with one or more amplification reaction reagents in a reaction receptacle using an automated pipettor, transporting the reaction receptacle to a centrifuge using the automated pipettor, centrifuging the fluid contents of the reaction receptacle, automatically removing the reaction receptacle from the centrifuge after centrifugation and placing the reaction receptacle in a thermal cycler, and subjecting the fluid contents of the reaction receptacle to one or more temperature cycles within the thermal cycler.

According to some aspects of the disclosure, the reaction receptacle is removed from the centrifuge and transported to the thermal cycler using the vial transfer arm.

According to some aspects of the disclosure, the reaction receptacle is placed in the centrifuge at a first location, and the reaction receptacle is removed from the centrifuge at a second, different location.

According to some aspects of the disclosure, the method further comprises a second automated pipettor, and the second automated pipettor automatically removes the reaction receptacle from the centrifuge after centrifugation and places the reaction receptacle in the thermal cycler.

According to some aspects of the disclosure, the receptacle is sealed by a cap before transporting the sealed receptacle to the centrifuge.

According to some aspects of the disclosure, the automated pipettor transports the cap to the receptacle and seals the receptacle by coupling the cap to the receptacle.

Some aspects of the disclosure are embodied in an improved method of preparing multiple different nucleic acid reaction mixtures within the workflow of an automated molecular instrument. The method comprises providing two or more reaction receptacles, providing two or more unit dose reagent containers, each unit dose reagent container corresponding to a respective reaction receptacle, and each unit dose reagent container containing a nucleic acid amplification reagent that is specific for one or more target nucleic acids, providing a receptacle containing a first bulk reagent, and combining at least a portion of the sample with at least a portion of the unit dose reagent and at least a portion of the bulk reagent in each of the two or more reaction receptacles. After combination, each reaction receptacle contains a different sample, a different unit dose reagent, and the same first bulk reagent.

According to further aspects of the disclosure, the method further comprises a receptacle containing a second bulk reagent, wherein the second bulk reagent is dispensed into each of the two or more unit dose reagent containers before combining at least a portion of the sample with at least a portion of the unit dose reagent and at least a portion of the bulk reagent in each of the two or more reaction receptacles.

According to some aspects of the disclosure, the second bulk reagent comprises a reconstitution reagent.

According to some aspects of the disclosure, the method further comprises transporting each of the two or more reaction receptacles to a heater, such as a heated incubator or a heating plate, to conduct a nucleic acid amplification assay.

Other features and characteristics of the present disclosure, as well as the methods of operation, functions of related elements of structure and the combination of parts, and economies of manufacture, will become more apparent upon consideration of the following description and the appended claims with reference to the accompanying drawings, all of which form a part of this specification, wherein like reference numerals designate corresponding parts in the various figures.

DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated herein and form part of the specification, illustrate various, non-limiting embodiments of the present disclosure. In the drawings, common reference numbers indicate identical or functionally similar elements.

FIG. 1 is a perspective view of a diagnostic system comprising a first module and a second module according to an embodiment.

FIG. 2 is a perspective view of a multiple receptacle device (“MRD”) according to an embodiment.

FIG. 3 is a partial bottom view of the MRD of FIG. 2 .

FIG. 4 is a top plan view of a first module of a diagnostic system according to an embodiment.

FIG. 5 is an exploded, top plan view of the first module and the second module according to an embodiment.

FIG. 6 is a top plan view of an amplification processing deck of the second module according to an embodiment.

FIG. 7 is a partial, front perspective view of the second module with a bulk reagent container compartment in an open position according to an embodiment.

FIG. 8 is a partial, top plan view of the second module and first module showing the bulk reagent container compartment in a closed position according to an embodiment.

FIG. 9 is a top perspective view of the bulk reagent container compartment and bulk reagent container transport of the second module, with the bulk reagent container compartment in an open position according to an embodiment.

FIG. 10 is a top perspective view of the bulk reagent container compartment and bulk reagent container transport of the second module, with the bulk reagent container compartment in a closed position and elution containers transported to an end of the bulk reagent container transport according to an embodiment.

FIG. 11 is a partial cross-sectional view of bulk reagent container compartment, with the bulk reagent container compartment in an open position according to an embodiment.

FIG. 12 is a partial cross-sectional view of bulk reagent container compartment and the bulk reagent container transport, with the bulk reagent container compartment in a closed position according to an embodiment.

FIG. 13 is a partial end view of bulk reagent container compartment, with the bulk reagent container compartment in a closed position according to an embodiment.

FIG. 14 is a top perspective view of a receptacle processing deck of the second module according to an embodiment.

FIG. 15 is a partial, front perspective view of the second module with a carousel compartment of a reagent pack changer in an open position according to an embodiment.

FIG. 16 is a partial, top perspective view of the pack carousel compartment according to an embodiment.

FIG. 17 is a partial, side perspective view of the pack carousel compartment according to an embodiment.

FIG. 18 is a cross-sectional, rear perspective view of an alternative embodiment of a reagent pack changer and a reagent pack storage compartment.

FIG. 19 is a top perspective view of a reagent pack embodying aspects of the present disclosure according to an embodiment.

FIG. 20 is a top perspective, cross-sectional view of a reagent pack along the line XX-XX in FIG. 19 according to an embodiment.

FIG. 21 is a perspective view of a robotic pipettor of the second module according to an embodiment.

FIG. 22 is a perspective view of a substance transfer pipettor of the robotic pipettor according to an embodiment.

FIG. 23 is an exploded, perspective view of a processing vial, a processing vial cap, and a pipettor probe according to an embodiment.

FIG. 24 is a transverse cross-section of the processing vial and the processing vial cap disposed within a processing vial well and a cap well, respectively, of a processing cap/vial compartment tray according to an embodiment.

FIG. 25 is a transverse cross-section of the processing vial cap removed from the cap well and inserted into the processing vial with the processing vial disposed within the processing vial well according to an embodiment.

FIG. 26 is an exploded, perspective view of an alternative embodiment of a processing vial, a processing vial cap, and a pipettor probe.

FIG. 27 is a top perspective view of an embodiment of a receptacle distribution module of the second module.

FIG. 28 is a bottom perspective view of the receptacle distribution module according to an embodiment.

FIG. 29 is a perspective view of an embodiment of a distributor head of a rotary distributor of the receptacle distribution module with a receptacle hook in a retracted position.

FIG. 30 is a perspective view of the distributor head with the receptacle hook in an extended position according to an embodiment.

FIG. 31 is an opposite side perspective view of the distributor head according to an embodiment.

FIG. 32 is a transverse cross-section of the rotary distributor with a reagent pack disposed therein according to an embodiment.

FIG. 33 is a transverse cross-section of the rotary distributor with an MRD disposed therein according to an embodiment.

FIG. 34 is a top front perspective view of an embodiment of a distributor moving system of the receptacle distribution module.

FIG. 35 is a top rear perspective view of the distributor moving system.

FIG. 36 is a top plan view of an embodiment of magnetic elution slots and reagent pack loading stations of the second module.

FIG. 37 is a front end perspective view of the magnetic elution slots and reagent pack loading stations according to an embodiment.

FIG. 38 is a back end perspective view of the magnetic elution slots and reagent pack loading stations according to an embodiment.

FIGS. 39 and 40 are perspective views of an embodiment of an MRD handoff device of the second module.

FIG. 41 is a flowchart illustrating the steps of a sample eluate preparation process according to an embodiment.

FIG. 42 is a flowchart illustrating the steps of a reaction mixture preparation process according to an embodiment.

FIG. 43 is a flowchart illustrating the steps of a process for performing an automated nucleic acid amplification reaction, such as PCR, according to an embodiment.

FIG. 44 is a flowchart illustrating a method of using diagnostic system according to one such embodiment.

The features and advantages of the present disclosure will become more apparent from the detailed description set forth below when taken in conjunction with the drawings, in which like reference characters identify corresponding elements throughout. In the drawings, like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements.

DETAILED DESCRIPTION

Unless defined otherwise, all terms of art, notations and other scientific terms or terminology used herein have the same meaning as is commonly understood by one of ordinary skill in the art to which this disclosure belongs. Many of the techniques and procedures described or referenced herein are well understood and commonly employed using conventional methodology by those skilled in the art. As appropriate, procedures involving the use of commercially available kits and reagents are generally carried out in accordance with manufacturer defined protocols and/or parameters unless otherwise noted. All patents, applications, published applications and other publications referred to herein are incorporated by reference in their entirety. If a definition set forth in this section is contrary to or otherwise inconsistent with a definition set forth in the patents, applications, published applications, and

other publications that are herein incorporated by reference, the definition set forth in this section prevails over the definition that is incorporated herein by reference.

References in the specification to “one embodiment,” “an embodiment,” a “further embodiment,” “an example embodiment,” “some aspects,” “a further aspect,” “aspects,” etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, such feature, structure, or characteristic is also a description in connection with other embodiments whether or not explicitly described.

As used herein, “a” or “an” means “at least one” or “one or more.”

As used herein, “sample” refers to any substance suspected of containing a virus or organism of interest or, alternatively, nucleic acid derived from the virus or organism of interest, or any substance suspected to have a nucleic acid of interest, such as a nucleic acid suspected of having genetic abnormalities or mutations. The substance may be, for example, an unprocessed clinical specimen, such as a blood or genitourinary tract specimen, a buffered medium containing the specimen, a medium containing the specimen and lytic agents for releasing nucleic acid belonging to the virus or organism, or a medium containing nucleic acid derived from the virus or organism which has been isolated and/or purified in a reaction receptacle or on a reaction material or device. For this reason, the term “sample” will be understood to mean a specimen in its raw form or to any stage of processing to release, isolate and purify nucleic acid derived from the virus or organism. Thus, references to a “sample” may refer to a substance suspected of containing nucleic acid derived from a virus or organism at different stages of processing and is not limited to the initial form of the substance.

This description may use relative spatial and/or orientation terms in describing the position and/or orientation of a component, apparatus, location, feature, or a portion thereof. Unless specifically stated, or otherwise dictated by the context of the description, such terms, including, without limitation, top, bottom, above, below, under, on top of, upper, lower, left of, right of, inside, outside, inner, outer, proximal, distal, in front of, behind, next to, adjacent, between, horizontal, vertical, diagonal, longitudinal, transverse, etc., are used for convenience in referring to such component, apparatus, location, feature, or a portion thereof in the drawings and are not intended to be limiting.

The section headings used in the present application are merely intended to orient the reader to various aspects of the disclosed system. The section headings are not intended to limit the disclosed and claimed inventions. Similarly, the section headings are not intended to suggest that materials, features, aspects, methods, or procedures described in one section do not apply in another section. Therefore, descriptions of materials, features, aspects, methods or procedures described in one section are intended to apply to other sections.

Nucleic Acid Diagnostic Assays

Aspects of the present disclosure involve diagnostic systems and methods that can be used in conjunction with nucleic acid diagnostic assays, including “real-time” amplification assays and “end-point” amplification assays.

Real-time amplification assays can be used to determine the presence and amount of a target nucleic acid in a sample which, by way of example, is derived from a pathogenic organism (e.g., bacterium, fungus, or protozoan) or virus. Thus, real-time amplification assays are often referred to as quantitative assays. By determining the quantity of a target nucleic acid in a sample, a practitioner can approximate the amount or load of the organism or virus in the sample. In one application, a real-time amplification assay may be used to screen blood or blood products intended for transfusion for blood borne pathogens, such as hepatitis C virus (HCV) and human immunodeficiency virus (HIV). In another application, a real-time assay may be used to monitor the efficacy of a therapeutic regimen in a patient infected with a pathogenic organism or virus, or that is afflicted with a disease characterized by aberrant or mutant gene expression. Real-time amplification assays may also be used for diagnostic purposes, as well as in gene expression determinations. Exemplary systems and methods for performing real-time amplification assays are disclosed by Macioszek et al. in U.S. Pat. No. 7,897,337.

In addition to implementation of embodiments of the disclosure in conjunction with real-time amplification assays, embodiments of the disclosure may also be implemented in conjunction with end-point amplification assays. In end-point amplification assays, the presence of amplification products containing the target sequence or its complement is determined at the conclusion of an amplification procedure. Thus, end-point amplification assays are often referred to as qualitative assays in that such assays do not indicate the amount of a target analyte present, but provide a qualitative indication regarding the presence or absence of the target analyte. Exemplary systems and methods for end-point detection are disclosed by Ammann et al. in U.S. Pat. No. 6,335,166. The determination may occur in a detection station that is integral with or at an external location relative to the incubator(s) in which the amplification reactions occur. In contrast, in “real-time” amplification assays, the amount of amplification products containing the target sequence or its complement is determined during an amplification procedure. In a real-time amplification assay, the concentration of a target nucleic acid can be determined using data acquired by making periodic measurements of signals that are a function of the amount of amplification product in the sample containing the target sequence or its complement, and calculating the rate at which the target sequence is being amplified from the acquired data. An example of such a real-time amplification assay is described by Light II et al. in U.S. Pat. No. 8,615,368.

In an exemplary real-time amplification assay, the interacting labels include a fluorescent moiety, or other emission moiety, and a quencher moiety, such as, for example, 4-(4-dimethylaminophenylazo) benzoic acid (DABCYL). The fluorescent moiety emits light energy (i.e., fluoresces) at a specific emission wavelength when excited by light energy at an appropriate excitation wavelength. When the fluorescent moiety and the quencher moiety are held in close proximity, light energy emitted by the fluorescent moiety is absorbed by the quencher moiety. But when a probe hybridizes to a nucleic acid present in the sample, the fluorescent and quencher moieties are separated from each other and light energy emitted by the fluorescent moiety can be detected. Fluorescent moieties having different and distinguishable excitation and emission wavelengths are often combined with different probes. The different probes can be added to a sample, and the presence and amount of target nucleic acids associated with each probe can be determined by alternately exposing the sample to light energy at different excitation wavelengths and measuring the light emission from the sample at the different wavelengths corresponding to the different fluorescent moieties. In another embodiment, different fluorescent moieties having the same excitation wavelength, but different and distinguishable emission wavelengths are combined with different probes. The presence and amount of target nucleic acids associated with each probe can be determined by exposing the sample to a specific wavelength light energy and the light emission from the sample at the different wavelengths corresponding to the different fluorescent moieties is measured.

A variety of different labeled probes and probing mechanisms are known in the art, including those where the probe does not hybridize to the target sequence. See, e.g., Brow et al. in U.S. Pat. No. 5,846,717 and Chun et al. in U.S. Patent Application Publication No. 2013/0109588. Some embodiments of the present disclosure operate regardless of the particular labeling scheme utilized, provided the moiety to be detected can be excited by a particular wavelength of light and emits a distinguishable emission spectra.

Where a nucleic acid amplification reaction is used to increase the amount of target sequence and/or its complement present in a sample before detection, it is desirable to include a “control” to ensure that amplification has taken place. See, for example, the amplification controls described by Wang in U.S. Pat. No. 5,476,774. Such a control can be a known nucleic acid sequence that is unrelated to the sequence(s) of interest. A probe (i.e., a control probe) having specificity for the control sequence and having a unique fluorescent dye (i.e., the control dye) and quencher combination is added to the sample, along with one or more amplification reagents needed to amplify the control sequence, as well as the target sequence(s). After exposing the sample to appropriate amplification conditions, the sample is alternately exposed to light energy at different excitation wavelengths (including the excitation wavelength for the control dye) and emission light is detected. Detection of emission light of a wavelength corresponding to the control dye confirms that the amplification was successful (i.e., the control sequence was indeed amplified), and thus, any failure to detect emission light corresponding to the probe(s) of the target sequence(s) is not likely due to a failed amplification. Conversely, failure to detect emission light from the control dye may be indicative of a failed amplification, thus calling into question the results from that assay. Alternatively, failure to detect emission light may be due to failure or deteriorated mechanical and/or electrical performance of an instrument for detecting the emission light.

In some embodiments, the assays performed in accordance with the description herein capture, amplify, and detect nucleic acids from target organisms in patient samples employing technologies, such as target capture, reverse transcription, and real-time polymerase chain reaction. The combination of reverse transcription and PCR is abbreviated “RT-PCR.” The following is a generalized assay processing description of the different technologies that may be implemented in accordance with aspects of the disclosure.

The target capture process isolates nucleic acid of the target (e.g., virus, bacterium, fungus, protozoan, mammalian cells, etc.) and purifies nucleic acid for amplification. The target organism, which can be in a variety of biological matrices from urine to blood, can be lysed by target capture reagents (“TCR”), whereby the nucleic acid is released. In one approach, capture oligonucleotide probes hybridize to a target nucleic acid. The capture probe/target nucleic acid complexes attach to magnetic particles in the TCR through nucleic acid hybridization. Exemplary disclosures for performing these methods are provided by US Pat. Nos. 6,140,678, 5,234,809, 5,693,785, and 5,973,138, and EP Patent No. 0 389 063. The magnetic particles are pulled to the side of a container and isolated by a magnet, and potential inhibitory substances are washed away (multiple wash cycles may be performed) to thereby provide a target nucleic acid. Hogan et al. provide an exemplary disclosure of this protocol in U.S. Pat. No. 7,172,863. See also International Publication No. WO 2003/097808 by Fort et al. If the target capture process is specific for the target nucleic acid, then it is the target nucleic acid that will primarily remain after the purification step. As a result, target capture enables the enrichment of a variety of sample types and significantly reduces the inhibition rate and can increase assay sensitivity. Exemplary methods of target nucleic acid capture are disclosed by, for example, Boom et al. in U.S. Pat. No. 5,234,864, Hawkins in U.S. Pat. No. 5,705,628, Collins et al. in U.S. Pat. No. 5,750,338, and Weisburg et al. in U.S. Pat. No. 6,534,273.

After completing the target capture process, the magnetic particles on which the target nucleic acid is immobilized are re-suspended, for example, with 20-60 μLof a wash solution comprising a low salt buffer or water. This will de-hybridize the target nucleic acid from the magnetic particles and, in the presence of a strong magnet, allow 5-50 μLof purified nucleic acid to be recovered as input into the amplification process.

Reverse transcription and PCR can be optimized to run in a single receptacle using common reagents as a one-step process. This method provides a sensitive means to detect low-abundance RNAs, and, although the method is not necessarily quantitative, specific controls can be included in the experiment if quantitative results are desired. (A reverse-transcription step is not required if the target nucleic acid is DNA.) In an exemplary implementation, before performing the real-time PCR reaction, RNAs are incubated with a retroviral enzyme (reverse transcriptase) under oil at 42° C. for approximately 30 minutes. This process creates a single-stranded DNA copy of the RNA target sequence. If the goal is to copy all RNAs present in the source material into DNA, non-specific primers or primer sets are used. In the case of mRNA, which has a polyadenylated (poly A) tail, an oligo dT primer can be used. Alternatively, a collection of randomized hexanucleotide primers can be used to ensure an primer will be present that is complementary to each of the messages. If only one RNA target is sought, a sequence-specific primer complementary to the 3′ end of the desired amplification product is used. RNase H is used to degrade the RNA molecule contained in the hybrid RNA-DNA duplex, so that the DNA strand is available to direct second-strand synthesis. Single-stranded DNA thus generated can serve as the template for PCR using sequence-specific primers to amplify the region of interest.

The polymerase is inactive at low temperatures and can be heat activated at 95° C. for several minutes (for example, approximately 10 minutes) before beginning PCR. Both reactions occur inside a thermal cycler (i.e., a module configured to expose the contents of the receptacle to temperatures that are cycled between two or more different temperatures), but real-time PCR requires accurate/rapid thermal cycling between denaturation (˜95° C.), annealing (˜55° C.), and synthesis (˜72° C.) temperatures. Fluorescence monitoring occurs at one or many color wavelengths—relating to one or many probes adapted to detect one or many target analytes—during each cycle or at another predetermined interval. PCR components may include, for example, the forward and reverse primers and a fluorogenic probe containing a reporter fluorescent dye on the 5′ end and a quencher dye on the 3′ end. (See, e.g., Holland et al., Proc. Natl. Acad. Sci. USA, 88(16):7276-7280 (1991).) During PCR, nucleic acid primers hybridize to opposite strands of the target nucleic acid and are oriented with their 3′ ends facing each other so that synthesis by a nucleic acid polymerization enzyme, such as a DNA polymerase, extends across the segment of the nucleic acid between them. While the probe is intact, the proximity of the quencher dye to the reporter dye greatly reduces the fluorescence emitted by the reporter dye. During amplification if the target nucleic acid is present, the fluorogenic probe anneals downstream from one of the primer sites and is cleaved by the 5′ nuclease activity of the polymerization enzyme during primer extension. The cleavage of the probe separates the reporter dye from the quencher dye, thus rendering detectable the reporter dye signal and removing the probe from the target strand, allowing primer extension to continue to the end of the template strand.

One round of PCR synthesis will result in new strands of indeterminate length which, like the parental strands, can hybridize to the primers upon denaturation and annealing. These products accumulate arithmetically with each subsequence cycle of denaturation, annealing to primers, and synthesis. The second cycle of denaturation, annealing, and synthesis produces two single-stranded products that together compose a discrete double-stranded product which is exactly the length between the primer ends. Each strand of this discrete product is complementary to one of the two primers and can therefore participate as a template in subsequent cycles. The amount of this product doubles with every subsequent cycle of synthesis, denaturation and annealing. This accumulates exponentially so that 30 cycles should result in a 2²⁸-fold (270 million-fold) amplification of the discrete product. Multiple Receptacle Devices

FIG. 2 illustrates one embodiment of MRD 160 that comprises a plurality of individual receptacles, or tubes, 162, preferably five. The receptacles 162 are formed to have open top ends and closed bottom ends (preferably in the form of cylindrical tubes), and are connected to one another by a connecting rib structure 164 which defines a downwardly facing shoulder extending longitudinally along either side of the MRD 160.

Alternatively, the receptacle may be any container suitable for holding a fluid or liquid, including, for example, a cuvette, beaker, well of a microtiter plate, test tube, and in some embodiments, a pipette tip. Unless explicitly stated or the context dictates otherwise, descriptions of an MRD or receptacle of an MRD are exemplary and should not be construed as limiting of the scope of the disclosure, as aspects of the disclosure are applicable to any suitable “receptacle.”

The MRD 160 in certain embodiments is formed from injection molded polypropylene, such as those sold by Montell Polyolefins, of Wilmington, Del., product number PD701NW or Huntsman, product number P5M6K-048. In an alternative embodiment, the receptacles 162 of the MRD are releasably fixed with respect to each other by means such as, for example, a sample tube rack or other holding structure.

An arcuate shield structure 169 can be provided at one end of the MRD 160. An MRD manipulating structure 166 extends from the shield structure 169. In certain embodiments, the manipulating structure 166 is configured to be engaged by an extendible and retractable hook of a receptacle distributor or a transport mechanism for moving the MRD 160 between different components of a first module of a diagnostic system. An exemplary transport mechanism that is compatible with the MRD 160 is disclosed by Ammann et al. in U.S. Pat. No. 6,335,166. The transport mechanism, in certain embodiments, engages the manipulating structure 166 from the underside of the manipulating structure as shown with arrow 60. In certain embodiments, the MRD manipulating structure 166 comprises a laterally extending plate 168 extending from shield structure 169 with a vertically extending piece 167 on the opposite end of the plate 168. A gusset wall 165 can extend downwardly from lateral plate 168 between shield structure 169 and vertical piece 167.

As shown in FIG. 3 , the shield structure 169 and vertical piece 167 have mutually facing convex surfaces. This, however, is just one way that the shield structure 169 and vertical piece 167 can be configured. The MRD 160 may be engaged by a receptacle distributor, a transport mechanism, and other components, by moving an engaging member, such as an extendible and retractable hook, laterally (in the direction “A”) into the space between the shield structure 169 and the vertical piece 167. The convex surfaces of the shield structure 169 and vertical piece 167 provide for wider points of entry for an engaging member undergoing a lateral relative motion into the space between the shield structure 169 and the vertical piece 167. Of course, as the engaging member is robotically controlled, it is understood that the convex surfaces are merely a design choice of the present embodiment and that other shaped surfaces are contemplated.

A label-receiving structure 174 having a flat label-receiving surface 175 can be provided on an end of the MRD 160 opposite the shield structure 169 and MRD manipulating structure 166. Human and/or machine-readable labels, such as scanable bar codes, can be placed on the surface 175 to provide identifying and instructional information on the MRD 160.

Further details regarding a representative MRD 160 are disclosed by Homer et al. in U.S. Pat. No. 6,086,827.

Diagnostic System

FIG. 1 illustrates a diagnostic system 10 according to an embodiment. Diagnostic system 10 can be configured to perform a plurality of different molecular assays on a plurality of samples. In some embodiments, diagnostic system 10 can be configured to perform different target nucleic acid amplification reactions. For example, diagnostic system 10 can be configured to perform a first target nucleic acid amplification reaction on a first subset of a plurality of samples, and perform a second, different target nucleic acid amplification reaction on a second subset of the plurality of samples.

In some embodiments, diagnostic system 10 comprises a first module 100 configured to perform at least one of the steps of a first target nucleic acid amplification reaction, and a second module 400 configured to perform at least one of the steps of a second target nucleic acid amplification.

In some embodiments, diagnostic system 10 is an integral, self-contained structure—first module 100 cannot be selectively coupled to and decoupled from second module 400.

In some embodiments, diagnostic system 10 is configured such that first module 100 can be selectively and operatively coupled to second module 400, and first module 100 can be selectively decoupled from second module 400. In some embodiments, first module 100 can be selectively coupled to second module 400 using, for example, mechanical fasteners (for example, bolts or screws), clamps, any combination thereof, or any other suitable attachment device. In some embodiments, suitable power and/or data lines are provided between the second module 400 and the first module 100. For example, in embodiments in which first module 100 can be selectively coupled to second module 400, second module 400 can extend the overall system capabilities of a diagnostic system including only first module 100 that was previously purchased by a customer.

The configurations and functions of first module 100 and second module 400 according to various embodiments are described below.

First Module

A first module 100 in which embodiments of the present disclosure may be implemented is shown schematically in plan view and designated by reference number 100 in FIG. 4 . The first module 100 includes various devices configured to receive one or more reaction receptacles (described in more detail below), within each of which is performed one or more steps of a multi-step nucleic acid test (NAT) designed to detect a virus or organism (e.g., bacterium, fungus, or protozoan). First module 100 can include receptacle-receiving components configured to receive and hold one or more reaction receptacles and, in some instances, to perform processes on the contents of the receptacles. Exemplary processes include, but are not limited to, adding substances such as sample fluid, reagents(e.g., target capture reagents, amplification reagents, buffers, oils, labels, probes, or any other reagent) and/or removing substances from a reaction receptacle; agitating a receptacle to mix the contents thereof; maintaining and/or altering the temperature of the contents of a reaction receptacle; heating or chilling the contents of a reaction receptacle; altering the concentration of one or more components of the contents of a reaction receptacle; separating or isolating constituent components of the contents of a reaction receptacle; detecting an electromagnetic signal emission (e.g., light) from the contents of a reaction receptacle; deactivating or halting an on-going reaction; or any combination of two or more of such processes.

In some embodiments, the first module 100 may include a receptacle input device 102 that includes structure for receiving and holding one or more empty reaction receptacles before the receptacles are used for performing one or more process steps of a NAT. The receptacle input device 102 may comprise a compartment, for example, a drawer or cabinet, that may be opened and loaded with a plurality of receptacles and may include a receptacle feeding device for moving receptacles, for example, one or more at a time, into a receptacle pick-up position. In some embodiments, the receptacle pick-up position comprises a registered or known position of the receptacle to facilitate removal of the receptacle by a receptacle distributor.

In some embodiments, the first module 100 may further include one or more bulk reagent container compartments configured to store one or more bulk containers that hold bulk reagents or hold waste material. In some embodiments, the bulk reagents include fluids such as water, buffer solution, target capture reagents, nucleic acid amplification reagents. In some embodiments, the bulk reagent container compartments may be configured to maintain the contents of such containers at prescribed storage temperatures and/or to agitate such containers to maintain the contents of the containers in solution or suspension.

In some embodiments, first module 100 comprises a first bulk reagent container compartment configured to store at least one bulk container that holds a nucleic acid amplification reagent, for example, a reagent for performing TMA, and a separate second bulk reagent container compartment configured to store at least one bulk container that holds a sample preparation reagent, for example, a target capture reagent. In some embodiments, first module 100 comprises a bulk reagent container compartment that stores both a bulk container that holds a nucleic acid amplification reagent and a bulk container that holds a sample preparation reagent, for example, a target capture reagent. In some embodiments, a bulk reagent container compartment that is configured to store at least one bulk container can be a compartment that houses a mixer, for example, an orbital mixer, that is configured to carry a container holding a sample preparation reagent, for example, a target capture reagent. In some embodiments, the one or more bulk container compartments can comprise a holding structure for carrying and agitating containers (e.g., containers of TCR with magnetically-responsive solid supports). Buse et al. in U.S. Provisional Application No. 61/783,670, “Apparatus for Indexing and Agitating Fluid Containers,” filed Mar. 14, 2013, which enjoys common ownership herewith, discloses an exemplary holding structure. In some embodiments, one or more bulk container compartments comprise a slidable tray that defines at least one recess configured to closely receive respective bulk containers.

In some embodiments, one or more of the bulk reagent container compartments of first module 100 can be configured to store at least two containers containing sample preparation reagents, for example, target capture reagents. In some embodiments, each target capture reagent is specific for a particular assay type (i.e., target nucleic acid), the type of nucleic acid (e.g., RNA or DNA), and/or the sample type (e.g., stool, urine, blood, etc.). For example, the target capture reagents can comprise probes having a region specific for the target nucleic acid. See, e.g. Weisburg et al. in U.S. Pat. No. 6,534,273.

The first module 100 may further include a sample loading device configured to receive and hold containers, such as test tubes, containing samples. The first module 100 may also include one or more substance transfer devices for transferring fluids, for example, sample fluids, reagents, bulk fluids, waste fluids, etc., to and from reaction receptacles and/or other containers. In some embodiments, the substance transfer devices may comprise one or more robotic pipettors configured for controlled, automated movement and access to the reaction receptacles, bulk containers holding reagents, and containers holding samples. In some embodiments, the substance transfer devices may also include fluid dispensers, for example, nozzles, disposed within other devices and connected by suitable fluid conduits to containers, for example, bulk containers holding the reagents, and to pumps or other devices for causing fluid movement from the containers to the dispensers.

In some embodiments, the first module 100 may further include a plurality of load stations, such as load stations 104, 106, 108 depicted in FIG. 4 , which are configured to receive racks and other forms of holders for carrying sample receptacles and various reagent containers that can be accessed by a substance transfer device. Examples of a load station and receptacle holder that can be used with embodiments are illustrated and described by Clark et al. in U.S. Pat. No. 8,309,036. In an embodiment where the first module 100 comprises a platform for performing a NAT, reaction reagents may comprise target capture reagents, lysis reagents, nucleic acid amplification reagents (e.g., the polymerases and nucleoside triphosphates needed for amplification), and/or nucleic acid detection reagents, such as detectable probes or intercalating dyes.

In some embodiments, the first module 100 may further comprise temperature ramping stations 110 configured to hold one or more reaction receptacles in an environment that is maintained at higher than ambient temperatures so as to raise the temperature of the contents of the receptacles. Exemplary temperature ramping stations are disclosed by Ammann et al. in U.S. Pat. No. 8,192,992.

In some embodiments, the first module 100 may further include one or more heater modules. The illustrated first module 100 includes three heated incubators 112, 114, 116, each of which is configured to receive a plurality of reaction receptacles and maintain the receptacles in an elevated temperature environment. Exemplary incubators are disclosed by Macioszek et al. in U.S. Pat. No. 7,964,413 and Heinz et al. in U.S. Patent Application Publication No. 2012/0221252. A heater module may alternatively be a heating plate. In certain embodiments, it is possible to have a heater module configured with one or more heated incubators and one or more heating plates.

Also, in an embodiment in which the first module 100 comprises a platform for performing a NAT, the first module may include sample-processing components, such as magnetic separation wash stations 118, 120, adapted to separate or isolate a target nucleic acid immobilized on a magnetically-responsive solid support from the remaining contents of the receptacle. Exemplary magnetic separation wash stations are disclosed by Hagen et al. in U.S. Patent Application Publication No. 2010/0288395 and Ammann et al. in U.S. Pat. No. 6,605,213.

Although not exemplified in the plan drawings of first module 100, the first module 100 may comprise one or more substance transfer devices, for example, robotic pipettors, in some embodiments. FIG. 21 , which is a perspective view of the robotic pipettor of the second module 400, exemplifies at least one way to configure a substance transfer device for the first module 100.

In some embodiments, the first module 100 may further include chilling modules 122 adapted to receive one or more reaction receptacles and hold the receptacles in a lower than ambient temperature environment so as to reduce the temperature of the contents of the receptacles.

And in some embodiments, the first module 100 may include a detector 124 configured to receive a reaction receptacle and detect a signal (e.g., an optical signal) emitted by the contents of the reaction receptacle. In one implementation, detector 124 may comprise a luminometer for detecting luminescent signals emitted by the contents of a receptacle and/or a fluorometer for detecting fluorescent emissions. The first module 100 may also include one or more signal detecting devices, such as fluorometers, coupled to one or more of the incubators 112, 114, 116 and which are configured and controlled to detect, preferably at specified, periodic intervals, signals emitted by the contents of the receptacles contained in the incubator while a process, such as nucleic acid amplification, is occurring within the reaction receptacles. An exemplary luminometer and an exemplary fluorometer are disclosed by Macioszek et al. in U.S. Pat. No. 7,964,413 and another exemplary fluorometer is disclosed by Heinz et al. in U.S. Patent Application Publication No. 2012/0221252.

The first module 100 further includes a receptacle transfer device, which, in the illustrated embodiment, comprises a receptacle distributor 150. The components of first module 100, for example, incubators 112, 114, 116, load stations 104, 106, 108, temperature ramping stations 110, wash stations 118, 120, and chilling modules 122, can also include a receptacle transfer portal through which receptacles can be inserted into or removed from the respective components. Each component may or may not include an openable door covering its receptacle portal. The receptacle distributor 150 is configured to move receptacles between the various components and retrieve receptacles from the components and deposit receptacles into the components. In one exemplary embodiment, the receptacle distributor 150 includes a receptacle distribution head 152 configured to move in an X direction along a transport track assembly 154, rotate in a theta (Θ) direction, and move receptacles in an R direction into and out of the receptacle distribution head 152 and one of the components of first module 100. An exemplary receptacle distributor is disclosed by Hagen et al. in U.S. Patent Application Publication No. 2012/0128451.

Second Module

Aspects of the disclosure are embodied in a second module 400 a diagnostic system. In some embodiments, the second module 400 is integral with the first module 100, and in other embodiments, the second module 400 may be selectively and operatively coupled to the first module 100 as described above. In some embodiments, the first module 100 to which the second module 400 can be operatively coupled include, for example, molecular instruments, such as the Panther® instrument system available from Hologic, Inc.

In one exemplary embodiment, the second module 400 is configured to perform nucleic acid amplification reactions, for example, PCR, and, in certain embodiments, to measure fluorescence in real-time (i.e., as the amplification reaction is occurring). A controller directs the components of the first module 100 and components of the second module 400 to perform the assay steps. In one exemplary embodiment, the first module 100 houses a computer and all fluids, reagents, consumables, and mechanical modules needed to perform the specified amplification-based assays, such as assays based on transcription-based amplification methods, for example, TMA or nucleic acid sequence-based amplification (NASBA). (TMA methods are described by Kacian et al. in U.S. Pat. Nos. 5,399,491 and 5,480,784; and NASBA methods are described by Davey et al. in U.S. Pat. No. 5,409,818 and Malek et al. in U.S. Pat. No. 5,130,238.) As explained above, the controller may comprise a computer and preferably can accommodate LIS (“laboratory information system”) connectivity and as well as remote user access. In some embodiments, second module 400 houses component modules that enable second amplification assays, melting analyses, and optionally additional functionalities. Other components may include a printer and an optional uninterruptible power supply.

Embodiments of the general configuration of the second module 400 are shown in FIGS. 1, 5, 6, and 14 . FIG. 1 is a perspective view of diagnostic system 10 comprising a second module 400 and the first module 100. FIG. 5 is a top plan view of the second module 400 separated from the first module 100. FIG. 6 is a top plan view of an amplification processing deck 430, for example, a deck containing components for performing PCR, of the second module 400. FIG. 14 is a top plan view of a receptacle processing deck 600 of the second module 400. Referring to FIGS. 1, 5, 6, and 14 , the component of the second module 400 can include, for example, a substance transfer device (for example, a robotic pipettor 402), a thermal cycler/signal detector 432, tip compartments 580 (e.g., two or more) configured to contain trays of disposable tips for the pipettor(s), processing cap/vial compartments 440 (e.g., two or more) configured to contain trays of disposable processing vials and associated caps, a bulk reagent container compartment 500, a bulk reagent container transport 550, a receptacle distribution system comprising a receptacle handoff device 602 and a receptacle distributor 312, which, in the exemplary embodiment shown, comprises a rotary distributor, MRD storage units 608, 610, 612 configured to store MRDs 160, magnetic elution slots 620 (e.g., two or more), a waste bin access door 652, a waste bin 652, a centrifuge 588, a reagent pack changer 700, reagent pack loading stations (e.g., two or more) 640, and a compartment 590 configured to store accessories, including, for example, consumables, output cards, and/or post-processing cap/vial assemblies.

As shown in FIG. 1 , the components may be positioned on different levels, or decks, arranged vertically through the module 400. In some embodiments, the substance transfer and handling device 402 can be a robotic pipettor 402 as shown in FIG. 1 . The robotic pipettor 402 is disposed near the top of the second module 400, above all other components, in some embodiments. The depicted configurations represent only a single embodiment. The vertical order of the decks and components may vary according to the intended use of diagnostic system 10. In the depicted embodiment, below the robotic pipettor 402, the amplification processing deck 430 includes the bulk reagent container compartment 500 and bulk reagent container transport 520, the centrifuge 588, the top of the thermal cycler/signal detector 432, the tip compartments 580, and the processing cap/vial compartments 440. Below the amplification processing deck 430, the receptacle processing deck 600 includes the receptacle handoff device 602, the rotary distributor 312, the MRD storage units 608, 610, 612, the magnetic elution slots 620, the reagent pack changer 700, and the reagent pack loading stations 640. As can be seen in FIG. 6 , the magnetic elution slots 620 and the reagent pack loading stations 640 on the receptacle processing deck 600 are accessible by the robotic pipettor 402 through a gap between modules of the amplification processing deck 430.

The receptacle distribution system comprising the receptacle handoff device 602 and the rotary distributor 312, is configured to receive a receptacle or group of receptacles (e.g., MRD 160) from the receptacle transfer device (e.g., the receptacle distributor 150) of the first module 100 and transfer the receptacle to the second module 400 and configured to move the receptacle into different positions in the second module 400. The rotary distributor 312 and the receptacle handoff device 602 are shown schematically in FIG. 14 . Further details regarding these components are described below.

In some embodiments, the second module 400 is operatively positioned adjacent to the first module 100, with the bulk reagent container transport 550 extending into the first module 100 so that elution containers 502, 504 can be transported by the bulk reagent container transport 550 from the bulk reagent container compartment 500 to a position in the first module 100 at which a substance transfer device, for example, a robotic pipettor, in the first module 100 can access the containers 502, 504.

In some embodiments, the second module 400 is generally self-supporting relative to first module 100 such that the second-module/first-module assembly is not over-constrained. Thus, in some embodiments, the second module 400 does not include any feet that contact the ground beneath the second module and support some or all of the weight of the module. In some embodiments, if the second module 400 includes its own rigid feet (e.g., two, three, or four feet), the feet of the first module 100 and the feet of the second module 400 could create an over-constrained geometry. In this case, one would carefully level all feet of the second module 400 and the first module 100 relative to each other to ensure that the assembly is level and that excessive stresses are not applied to attachment points between the second module 400 and the first module 100. To avoid such a potentially over-constrained geometry, the second module 400, in some embodiments, is cantilevered off the first module 100 if the first module feet can support the additional weight of the second module. In some embodiments, some of the weight of the second module 400 may be supported by a single foot on a far edge of the second module 400 away from the first module 100.

In some embodiments, second module 400 and first module 100 are mounted to an integral frame.

In some embodiments, the interface between the second module 400 and the first module 100 is blocked and sealed where possible to prevent airflow between the two modules. Existing air inlets on the side of the first module 100 facing the second module 400 may be ducted through the second module 400 to a fresh air source. The side wall of the second module 400 facing the first module 100 can be covered by panels to block airflow into the first module 100. Such panels can include openings where necessary for receptacle or container transfer between the second module 400 and first module 100, cable routing, etc.

Components of exemplary embodiments of the second module 400 are described below.

Reagent Packs

In some embodiments, amplification reagents and other reagents may be provided in the second module 400 in lyophilized form in a reagent pack comprising a cartridge that includes wells within which the lyophilized reagent may be reconstituted. Examples of cartridges that can be used in this embodiment are disclosed by Knight et al. in U.S. Provisional Application No. 61/782,320, “Systems, Methods, and Apparatus for Performing Automated Reagent-Based Assays,” filed Mar. 14, 2014, which enjoys common ownership herewith (these cartridges are both identified by reference number 500 in FIGS. 10A and 10B). The reagent pack is further configured to be stored within the second module 400 and, in some embodiments, to be moved within the second module 400 by the distributor 312, and inserted and removed from the reagent pack changer 700.

Details of a reagent pack 760, according to one embodiment, are shown in FIGS. 19 and 20 . The reagent pack 760 may include a plurality of mixing wells 762, each of which contains a lyophilized unit-dose, assay-specific reagent 768, which may be in pellet form. (As used herein, “unit-dose” or “unitized” means an amount or concentration of a reagent sufficient to perform one or more steps of a single assay for a single sample.) In some embodiments, the unit-dose reagent 768 comprises a component for performing a nucleic acid amplification reaction. For example, the nucleic acid amplification reaction component can be a polymerase, nucleoside triphosphates, or any other suitable component. In the illustrated embodiment, the reagent pack 760 includes ten mixing wells 762. But in some embodiments, the reagent pack 760 may include more or fewer than ten mixing wells. Each mixing well 762 of a single reagent pack 760 may hold the same reagent, or the wells 762 may hold different reagents, or some wells 762 may hold the same reagent and some may hold different reagents. Exemplary assay specific reagents 768 held in the reagent pack 760 include unitized reagents for performing a single amplification reaction, for example, PCR and/or a detection reaction utilizing a sample. Such reagents may be specific for one target nucleic acid or a plurality of different target nucleic acids. For example, the plurality of different target nucleic acids may be part of a respiratory panel, and the unitized reagents are sufficient to conduct a PCR reaction targeting Flu A, Flu B, RSV, parainfluenza 1, 2, and 3, Human Metapneumovirus, Adenoviris, H1, H3, 2009 H1N1, and/or Tamiflu resistance. In an embodiment, each reagent pellet 768 is held at the bottom of the associated mixing well 762 with an electrostatic charge imparted to the pellet 768 and/or the mixing well 762. In other embodiments, each reagent pellet 768 is held at the bottom of the associated mixing well 762 with one or more physical feature present in the mixing well 762, for example, those disclosed by Knight et al. in U.S. Provisional Application No. 61/782,320.

In some embodiments, the mixing wells 762 are covered by a pierceable foil 766 adhered to the top of the reagent pack 760. Foil 766 can be pierced by a pipette tip 584 to enable reconstitution agents or other substances to be dispensed into the mixing well 762 and to enable reconstituted reagent to be aspirated from the mixing well 762.

In some embodiments, the reagent pack 760 further includes a manipulating structure 764, for example, a manipulating hook, that is similar to the manipulating structure 166 of the MRD 160 and is configured to be engageable by a manipulating structure, for example, a hook, of the rotary distributor 312. The reagent pack 760 may include a rear recess 770 that is configured to align the reagent pack within a reagent pack carrier, as will be described below.

Tip Compartments

As shown in FIGS. 1, 5, and 6 , tip compartments 580 are configured to hold trays 582 of disposable pipette tips in a manner that enables the tips held in the drawers 580 to be accessed by the robotic pipettor 402. In the illustrated embodiment, the second module 400 includes two tip compartments 580, each configured to hold up to three trays 582 of disposable pipette tips. The compartments 580 may be configured to accept commercially-available trays of disposable pipette tips. Exemplary, commercially available pipette tips and trays are available from TECAN (TECAN U.S. Inc., Research Triangle Park, N.C.). Such tips are available in a variety of volumetric capacities, and each tip may be conductive to facilitate capacitive liquid level sensing and tip-present detection, as is well known in the art. Exemplary trays hold ninety-six pipette tips.

The tip compartments 580 are configured to be accessible to an operator for reloading of trays 582. In one contemplated embodiment, the tip compartment 580 comprises a drawer configured to be pulled out of the second module 400 to enable an operator to place the trays 582 of tips into the drawers 580 and to remove empty trays from the drawers 580. A door or cover panel that is either part of each drawer 580 or the housing of diagnostic system 10 is opened to access each tip compartment 580 behind it. The door or cover panels may provide an esthetically pleasing appearance to the front of the second module 400. Manual or automated locks, controlled by the system controller, may be provided to prevent the compartment 580 from being opened when the second module 400 is operating. In some embodiments, visible and/or audible warning signals may be provided to indicate that a compartment 580 is not closed properly. In an alternative embodiment, compartment 580 comprises an access door and a slidable tray, wherein the tray is configured to slide out from second module to thereby provide loading access to an operator.

Substance Transfer and Handling System

The substance transfer and handling system 402, for example, a robotic pipettor, shown in FIGS. 1, 21, and 22 is a dual arm system comprising a front arm 408 and a back arm 416. However, other robotic pipettor and handling configurations are contemplated, and the presently depicted embodiment is only exemplary. Substance transfer and handling system 402 can be configured to dispense and/or aspirate substances into and/or from a container, receptacle, well, etc., in second module 400. In an exemplary embodiment, the front arm 408 includes a substance transfer pipettor 410 configured to aspirate fluid and dispense fluid and includes a pump, for example, an integrated syringe pump, and the back arm 416 includes a vial transfer arm 418 and does not perform substance transfer. The robotic pipettor system 402 comprises a Cartesian gantry assembly with two transverse tracks 404, 406, a back arm longitudinal track 420, and a front arm longitudinal track 412. The designations “longitudinal” and “transverse” are merely for distinguishing the two sets of tracks, which may be orthogonal to one another, but otherwise the designations are arbitrary.

The substance transfer pipettor 410 may be driven back and forth along the front arm longitudinal track 412 by a belt, drive screw, or other motion transmission device coupled to a motor, and the vial transfer arm 418 may be driven back and forth along the back arm longitudinal track 420 by a belt, drive screw, or other motion transmission device coupled to a motor. The front arm longitudinal track 412 may be driven back and forth along the transverse tracks 404, 406 by a belt, drive screw, or other motion transmission device coupled to a motor, and the back arm longitudinal track 420 may be driven back and forth along the transverse tracks 404, 406 by a belt, drive screw, or other motion transmission device coupled to a motor. The substance transfer pipettor 410 and the vial transfer arm 418 include probes that are driven along the Z, or vertical, axis, for example, by a motor coupled to the probes, e.g., by a gear, a rack and pinion, a lead screw, or other suitable device. The motors may be under the control of a system controller. The motors may be stepper motors and may include rotary encoders for controlling and monitoring the position of the track or pipettor to which it is coupled. Each of the tracks has home sensors (or limit switches) for indicating when the substance transfer pipettor 410 or the vial transfer arm 418 is in one or more designated positions, such as a designated “home” position. Similarly, each device may have a vertical home sensor for indicating when the probe is in one or more designated vertical positions, such as a designated vertical “home” position. Such sensors for indicating a home position may include optical sensors (e.g., slotted optical sensors), proximity sensors, magnetic sensors, capacitive sensors, etc.

In one exemplary embodiment, the substance transfer pipettor 410 is configured to accept TECAN 1 mL disposable pipette tips by inserting the probe thereof into a disposable pipette tip, and an interference fit between the probe and the pipette tip frictionally secures the pipette tip to the end of the probe. The front arm 408 and the substance transfer pipettor 410 are configured to access at least parts of both the amplification processing deck 430 and the receptacle processing deck 600 on the second module 400. The substance transfer pipettor 410 may include integrated tip sensing for confirming the presence or absence of a disposable pipette tip, capacitive level sensing for detecting contact by the pipette tip with the surface of the fluid contents of a reaction receptacle or other container and determining the level of the fluid contents based on the detected vertical position of the pipettor, and pressure sensing for sensing pressure fluctuations within the substance transfer system during fluid dispensing or aspiration. The substance transfer pipettor 410 is capable of transferring fluids, caps, or cap/processing vial assemblies such as those described below.

The vial transfer arm 418 is a “pick and place” device configured pick up a cap/vial assembly by inserting the probe thereof into a cap that is coupled to a vial, as will be described below.

Pipettor Pump

In an exemplary embodiment, the pump for the substance transfer pipettor 410 comprises a ceramic piston driven by a servomotor and a lead screw. The servomotor is controlled by the system controller, and the device can include rotary encoder feedback to the system controller and home sensors for monitoring the position of the piston. The syringe may have a volume of between 0.5 and 3 mL (preferably 1.05 mL) and, in certain embodiments, is a ceramic. The pump can preferably dispense very small volumes (5 μL) of fluid with +/−5% coefficient of variation (CV) measured across 30 discrete dispenses. To achieve this performance, in certain embodiments, the pump includes a solenoid valve to release pressure at the end of the stroke to ensure consistent fluid shear.

Processing Cap/Vial Assembly

In general, the processing vial provides a receptacle for containing reaction fluids for performing PCR or other process. The cap is configured to be placed into or onto the vial in an automated manner so as to close off the vial. In some embodiments, the cap is configured to receive the end of the vial transfer arm 418 with a friction fit, so that the transfer arm 418 can thereafter pick up the cap and place it into or onto the vial. The cap and vial are configured to lock together so that, once the cap is placed into or onto the vial, the cap and the vial are interlocked to form a cap/vial assembly. The robotic pipettor, with the probe of the transfer arm 418 inserted into the cap, can then pick up the cap/vial assembly and transfer it from one location within the second module 400 to another location. Exemplary caps and processing vials are disclosed by, for example, Knight et al. in U.S. Provisional Application No. 61/782,320.

Details of an exemplary embodiment of the processing vial 464, the processing vial cap 476, and the vial transfer arm probe 422 are shown in FIGS. 23-26 .

In the embodiment shown in FIGS. 23-25 , the processing vial 464 may have a conical shape and an open top end 465 surrounded by a locking collar 466. Lateral through holes 468 are formed through the locking collar 466 at diametrically opposed locations. A latch hook 472 is located above each through hole 468.

The processing vial cap 476 has an open top end 478 and a closed lower end 480. An annular collar 482 extends about the cap 476 at a position between the top end 478 and lower end 480. Collar 482 of the vial 476 sits atop the thermal cycler when the vial 476 is placed therein, ensuring a close fit of the vial within the wells of the thermal cycler. An exemplary thermal cycler for use with processing vial 476 is disclosed by Buse et al. in U.S. Patent Application Publication No. 2014/0038192. A lower portion of the cap 476 beneath the collar 482 defines a plug that fits into the open top end 465 of the processing vial 464. This plug is sized so as to fit into the processing vial 464 with an interference, friction fit. A latch collar 484 extends about the cap 476 at a position below the collar 482. Seal rings 486, 488 extend about the cap 476 at positions below the latch collar 484.

FIGS. 24 and 25 show, in cross-section, a processing vial cap 464, initially held in a cap well 490 of a cap/vial tray 460, and a processing vial 464 held in a vial well 474 of the cap/vial tray 460. After fluids are dispensed into the processing vial 464 with the disposable pipette tip 584 (connected to a robotic pipettor), the processing vial 464 is capped by a processing vial cap 476 by inserting the closed lower end 480 of the cap 476 into the open top end 465 of the vial 464, until a bottom surface of the collar 482 of the cap 476 abuts a top surface of the locking collar 466 of the vial 464. The latch collar 484 of the cap 476 snaps in beneath the latch hooks 472 of the vial 464 to secure the cap 476 to the vial 464. The cap 476 and the vial 464 are thereafter locked together and the cap/vial assembly may be picked up and moved by the pipettor. The cap/vial assembly can be removed from the pipettor probe 422 by an eject device engaging a rim 479 surrounding open end 478 to pull the cap/vial assembly off the probe 422. The seal rings 486, 488 of the cap 476 preferably have outer diameters that are slightly larger than the inner diameter of the upper portion of the vial 464, thereby forming a tight seal between the cap 476 and the vial 464 as the cap and vial are made of materials, such as suitable plastics, that are at least partially resilient.

An alternative processing cap/vial assembly is shown in FIG. 26 , which is an exploded perspective view of a processing vial 670 and a processing vial cap 660. Processing vial cap 660 includes closed lower end 662, a tapered opening 668, and a latch collar 664 having latch fingers 666. The vial 670 includes a lock collar 672 surrounding the open top end of the vial 670 and a collar 674. Collar 674 the vial 670 sits atop the thermal cycler when the vial 670 is placed therein, ensuring a close fit of the vial within the wells of the thermal cycler. After fluid is dispensed into the vial 670, the vial is capped by first inserting the pipettor probe 422 into the tapered opening 668 of the processing vial cap 660 to frictionally secure the cap 660 to the pipettor probe 422 and then picking up the cap 660 with the pipettor and inserting the closed lower end 662 of the cap 660 into the open top end of the vial 670 until the latch fingers 666 lockingly snap onto the lock collar 672 of the vial 670. The cap 660 and the vial 670 are thereafter locked together and the cap/vial assembly may be picked up and moved by the pipettor. The cap/vial assembly can be removed from the probe 422 by an eject device engaging a rim 669 surrounding opening 668 to pull the cap/vial assembly off the probe 422.

The second module 400 may include “vial present” sensors. The vial present senor is used as a process control measure to verify that a vial is attached to the cap. The substance transfer pipettor 410 (front arm 408) and the vial transfer arm 418 (back arm 416) will detect when a cap is attached to the arm. One way substance transfer pipettor 410 or the vial transfer arm 418 will detect when a cap is present is by a strip sleeve on the probe 422. When the cap is picked by the probe, the upper rim of the cap pushes on and raises the sleeve (e.g., a few millimeters), and this movement may be detected by a sensor. However, pipettors often cannot detect if a vial is attached to the cap. In one exemplary embodiment, the vial present sensor is an optical sensor (or multiple sensors) that either arm 408, 416 can move past/through as it transports a capped vial into or out of the centrifuge 588. The vial present sensor will trigger on the vial (if present) as the arm moves past the sensor.

Bulk Reagent Container Compartment and Bulk Reagent Container Transport

In one exemplary embodiment, the bulk reagent container compartment 500 is configured to hold a plurality of bulk reagent containers. Each bulk reagent container can hold a reagent for use in multiple reaction receptacles. In some embodiments, the bulk reagent containers are bottles or any other container suitable for containing reagents in bulk. In some embodiments, the bulk reagents within the bulk reagent containers can include a sample preparation reagent (e.g., target capture reagent (TCR), a wash solution, an elution reagent, or any other sample preparation reagent), a reconstitution reagent, or any other required bulk reagent. In some embodiments, the bulk reagent containers hold a quantity of the bulk reagent sufficient to perform between about 50 to 2000 assays. In some embodiments, the bulk reagent containers hold a quantity of the bulk reagent sufficient to perform between about 250 to 1000 assays. In some embodiments, the bulk reagent containers hold a quantity of the bulk reagent sufficient to perform less than about 250 assays, or more than about 1000 assays. In some embodiments, the bulk reagents are for performing isothermal nucleic acid amplification reactions, for example, a transcription-based amplification reaction such as TMA.

In some embodiments, the bulk reagent container compartment 500 can be configured to hold two elution buffer containers, two oil containers, and four reconstitution fluid containers. The bulk reagent container compartment 500 may be opened by an operator to load containers. For example, bulk reagent container compartment 500 may be a drawer that is slid out from the main body of diagnostic system 10. In some embodiments, once closed, the bulk reagent container transport 550 moves the elution buffer containers into the first module 100 to a location in which a substance transfer mechanism, for example, a robotic pipettor, can access the containers. In some embodiments, the bulk oil containers and the bulk reconstitution fluid containers remain in the bulk reagent container compartment 500, where they are accessible to the substance transfer pipettor 410.

Containers carried on the bulk reagent container compartment 500 may be identified by machine-readable code, such as RFID. An indicator panel 507 having visible (e.g., red and green LEDs) and/or audible indicators provides feedback to the operator regarding container status.

The bulk reagent container compartment 500 and bulk reagent container transport 550 are shown in FIGS. 5-10 . In some embodiments, the bulk reagent container compartment 500 is located on the amplification processing deck 430 adjacent the tip compartments 580 and may be accessed from the front of the second module 400. The bulk reagent container compartment 500 may be pulled out to enable an operator to place two containers 502, 504 containing an elution buffer as well as a number of bulk containers, or other types of fluid containers, containing other reagents, such as, for example, oil or reconstitution buffer, into the drawer 500. The number of containers accommodated by the drawer 500 is dictated by considerations of intended throughput and desired time period between required re-stocking of supplies.

A door or cover panel, which is either part of the bulk reagent container compartment 500 or the housing of diagnostic system 10 is opened to access the bulk reagent container compartment 500 behind it. The door or cover panel can provide an esthetically pleasing appearance to the front of the second module 400. Automated locks, controlled by the system controller, may be provided to prevent the bulk reagent container compartment 500 from being pulled open when the second module 400 is operating. In some embodiments, visible and/or audible warning signals may be provided to indicate that the bulk reagent container compartment 500 is not closed properly.

When the bulk reagent container compartment 500 is closed, the containers 502, 504 are moved to the far end of the drawer 500, where they are positioned in operative engagement with the bulk reagent container transport 550 extending laterally from an end of the drawer 500 into the first module 100. Upon closing the bulk reagent container compartment 500, the bulk reagent container transport 550 is activated to move the containers 502, 504 into the first module 100 to a position at which the robotic pipettor of the first module 100 can access the containers 502, 504. The bulk reagent container transport 550 may be activated manually by an operator (e.g., pressing a button or switch) or automatically by the system controller upon receipt of an input signal indicating that the bulk reagent container compartment 500 has been fully closed, thereby placing the containers 502, 504 into operative position with respect to the bulk reagent container transport 550.

Details of the bulk reagent container compartment 500 are shown in FIGS. 9-13 . In some embodiments, the bulk reagent container compartment 500 includes a container tray 506 configured to hold the plurality of reagent containers, and a container carriage 512 disposed at the end of the container tray 506 and configured to carry elution reagent containers 502, 504. In some embodiments, the container tray 506 and the container carriage 512 are moveable along a track 508 between a withdrawn position as shown in FIG. 9 (see also FIG. 7 ) and a closed position as shown in FIG. 10 (see also FIG. 8 ).

The container carriage 512 is carried on a carriage transport 522 configured to be movable with the container tray 506 along the track 508. As shown in FIGS. 11 and 12 , the carriage transport 522 includes horizontal carriage rails 524 and 526 that engage rail slots 514, 516, respectively, formed in the container carriage 512 to retain the container carriage 512 within the carriage transport 522.

The bulk reagent container compartment 500 is configured to permit an operator to place reagent containers 502, 504 within the container carriage 512 when the drawer is in the open position, as shown in FIGS. 7 and 9 . Upon closing the drawer, to the position shown in FIGS. 8 and 10 , the reagent container carriage 512 can be released from the carriage transport 522 and engaged by the bulk reagent container transport 550 to pull the carriage 512 to a lateral position with respect to the track 508 of the container tray 506, as shown in FIG. 10 . In this manner, it is possible to transfer bulk reagents from the second module 400 to the first module 100.

More particularly, the carriage transport 522 moves along the track 508 as the container tray 506 is moved into the open or closed positions. As shown in FIG. 11 , the carriage transport 522 includes a pivoting carriage lock 532 configured to pivot about pivot pin 534 and including a locking leg 536 that extends upwardly through an opening 528 formed in the bottom of the carriage transport 522 and into a lock recess 520 formed in the bottom of the container carriage 512. A trigger leg 538 extends below the carriage transport 522. As the container tray 506 is moved into the closed position (to the left in FIG. 11 ) the trigger leg 538 of the pivoting carriage lock 532 engages a lock trigger 510 projecting upwardly from the track 508, thereby causing the carriage lock 532 to pivot counterclockwise, as shown in FIG. 12 , to withdraw the end of the locking leg 536 from the lock recess 520 of the container carriage 512. With the trigger leg 538 withdrawn from the lock recess 520, the container carriage 512 and the containers 502, 504 carried therein, are able to slide laterally out of the carriage transport 522 and onto the bulk reagent container transport 550.

The bulk reagent container transport 550 includes a powered carriage transport mechanism for moving the container carriage 512 and containers 502, 504. In one exemplary embodiment, as shown in FIGS. 9, 10, and 13 , the carriage transport comprises motor 552 and a continuous belt 554 disposed over the output shaft of the motor and an idler wheel 556 located on an opposite end of the container transport 550 from the motor 552. Motor 552 may comprise a stepper motor and may include a rotary encoder for monitoring and controlling, via control signals and feedback data, the position of the motor.

The carriage transport mechanism further includes a sled 558 with a carriage hook 564 extending therefrom. The belt 554 is attached to a portion of the sled 558 so that movement of the belt by the motor 552 causes a corresponding translation of the sled 558 in one direction or the other along the transport 550.

As shown in FIGS. 12 and 13 , as the container tray 506 is moved to a closed position in which the trigger leg 538 of the pivoting carriage lock 532 engages the lock trigger 510 to withdraw the locking leg 536 from the lock recess 520, the carriage hook 564 passes into a carriage hook slot 530 formed in the carriage transport 522 and engages a hook catch 518 formed in the container carriage 512. The sled 558 and carriage hook 564 may then be translated laterally along the container transport 550 by the belt 554 to pull the container carriage 512 off of the carriage transport 522 and onto the bulk reagent container transport 550. As shown in FIG. 11 , the bulk reagent container transport includes carriage rails 566, 568 that will engage the rail slots 514, 516, respectively, of the container carriage 512 as the container carriage 512 is pulled onto the bulk reagent container transport 550.

As shown in FIG. 13 , a home flag 560 projects from the sled 558 and engages a slotted optical sensor 562 to indicate that the sled 558 and the carriage hook 564 are in the fully-extended position shown in FIG. 13 . A second slotted optical sensor 570 is provided closer to the motor 552 (see FIG. 9 ). The second optical sensor 570 is engaged by the home flag 560 when the sled 558 and hook 564 are in the fully retracted position, as shown in FIG. 9 . Signals from the sensors 562, 570 are communicated to a system controller to monitor the position of the sled 558. Alternatively, the bulk reagent container transport 550 may include limit switches (e.g., contact switches) to stop operation movement of the sled 558 at the fully extended and/or fully retracted positions, for example, by generating stop signals communicated to a controller which then sends stop commands or terminates power to the motor 552. Still other types of sensors may be used for indicating extended and retracted stop positions, including proximity sensors, magnetic sensors, capacitive sensors, etc. Cycler/Signal Detector

Cycler deck 430 comprises a cycler 432, such as, for example, a thermal cycler. The cycler 432 is used in nucleic acid amplification reactions and the selection of cycler type depends on the nature of the amplification reaction intended to be run on the second module 400. For purposes of the present disclosure, exemplification will be made using a thermal cycler. However, it is understood that the cycler type incorporated into the second module 400 depends on the amplification reaction intended to be run on the second module 400.

An exemplary embodiment of a thermal cycler 432 is disclosed by Buse et al. in U.S. Patent Application Publication No. 2014/0038192. An exemplary embodiment of a signal detector 432 is disclosed by Hagen et al. in U.S. application Ser. No. 14/200,460, “Indexing Signal Detection Module,” filed Mar. 7, 2014, which enjoys common ownership herewith.

In certain embodiments, the thermal cycler can have different thermal zones. Such thermal cyclers allow the system to run separate assays under different conditions. For example, in a two zone thermal cycler, a first assay can be run under a first set of time and temperature conditions and a second assay can be run under a second set of time and temperature conditions. It is contemplated that the multi-zone thermal cycler can have two, three, four, five, or even six or more separate thermal zones. Generally, to the extent that a multi-zone thermal cycler is implemented in the system, the number of zones for the multi-zone thermal cycler is evenly divisible into 96 (i.e., 2, 4, 6, 8, etc.)

Centrifuge

As shown in FIGS. 1, 5, and 6 , a centrifuge 588 can be located on the amplification processing deck 430 of the second module 400. In one exemplary embodiment, the centrifuge 588 will centrifuge one or more (up to five in one embodiment) capped processing vials 464, 670 at a time. In an exemplary embodiment, each vial is centrifuged before PCR to ensure that sample material is concentrated primarily in the bottom of the processing vial 464, 670 and to remove any air bubbles from the contents of the vial 464, 670, which can affect heat transfer and optical transmission quality. The substance transfer pipettor 410 of the front arm 408 places the capped vial 464, 670 into the centrifuge 588 at an access port indicated at reference number 589. After centrifuging is complete, the vial transfer arm 418 of the back arm 416 removes the capped vial 464, 670 from the centrifuge 588 at an access port indicated at reference number 587 and places it in the thermal cycler 432. In an embodiment, the centrifuge configuration (e.g., by providing separate ports 587, 589) allows the substance transfer pipettor 410 (front arm 408) and the vial transfer arm 418 (back arm 416) to load/unload capped vials 464, 670 simultaneously without colliding with each other. As such, in one embodiment, the centrifuge not only performs its function of providing centrifugation of loaded vials, but also functions as a vial transport mechanism by transporting capped vials 464, 670 from a position 589 accessible to the substance transfer pipettor 410 to a position 587 where the capped vials 464, 670 are accessible to the vial transfer arm 418. In certain embodiments the substance transfer pipettor 410 is unable to access position 587 and the vial transfer arm 418 is unable to access position 589.

In addition, the centrifuge 588 may be configured to track the position(s) of the loaded vial(s) within the centrifuge and determine when a vial is positioned at either access port 587, 589. For example, a turntable or other rotating structure on which the loaded vial(s) is (are) centrifuged may be driven by a stepper motor that may include a rotary encoder for precise movement of the turntable and tracking motor counts and/or the turntable or rotating structure may include a rotational position indicator, such as a home flag sensor, configured to indicate one or more rotational positions or reference points.

In one exemplary embodiment, the maximum revolution speed of the centrifuge is 3000 revolutions per minute, but other revolution speeds are contemplated based on, inter alia, the composition of the solution being centrifuged and the time period required to provide adequate centrifugation.

Receptacle Distribution System and Rotary Distributor

In one embodiment, the receptacle distributor, which is configured to move a receptacle onto the receptacle distributor at a first location on the second module, carry the receptacle from the first location to a second location on the second module that is different from the first location, and move the receptacle off the receptacle distributor at the second location on the second module, comprises a rotary distributor. In an exemplary embodiment, the rotary distributor of the receptacle distribution system does not constitute a robotic pipettor, such as substance transfer and handling device 402 described above, or other substance transfer device comprising a vial transfer arm that is supported on a structure for automatically moving the pipettor in different Cartesian directions (i.e., a x-y-z directions), but is also a 3-axis robot designed to transport MRDs 160 and reagent packs 760 between different components of the second module 400. In one exemplary embodiment, rotary distributor 312 works by a hook and rail system in which an extendible and retractable hook pulls or pushes MRDs 160 or reagent packs 760 into or from a distributor head of the rotary distributor 312. Within the distributor head, the MRD 160 or reagent pack 760 is supported and guided by rail and wall features within the head. The rotary position of the distributor head is controlled and monitored by a rotary encoder on the motor for position feedback and has a home sensor. The distributor hook may be belt driven with home and end of travel sensors (e.g., slotted optical sensors, limit switches, etc.) The rotary distributor 312 is also configured for powered, vertical (or z-axis) motion of the distributor head for vertical translation of an MRD 160 or reagent pack 760. In one exemplary embodiment, the rotary distributor 312 is configured to allow for at least 100 mm of z-axis travel. The distributor head may include an MRD/reagent pack presence sensor in the head. In one exemplary embodiment, the rotary distributor is configured to transfer an MRD 160 between any two modules of the second module 400 within four seconds. In certain embodiments, each axis can make a full travel move in approximately one second.

Details of an exemplary receptacle distribution system are shown in FIGS. 27 and 28 . In the illustrated embodiment, a receptacle distribution system 200 includes a frame 202 comprising legs 203, 204 and 205 extending between a bottom panel 208 and a top panel 206. The receptacle handoff station 602 is mounted on a handoff station bracket 606 attached to the bottom panel 208 of frame 202 and will be discussed further below. Magnetic elution slots 620 and reagent pack loading stations 640 are supported on a bracket 642 attached to legs 204 and 205 of frame 202 and will be discussed further below. A rotary distributor 312 is supported on a first upright wall 218 and a second upright wall 220 within the frame 202.

Details of an exemplary rotary distributor 312 are shown in FIGS. 29-31 . The exemplified rotary distributor 312 includes a distributor head 314 defining a partial enclosure for holding an MRD 160 or reagent pack 760 and a receptacle hook 318 configured to engage the manipulating structure 166 of an MRD 160 or the manipulating hook 764 of the reagent pack 760.

A hook actuator system 316 linearly translates the receptacle hook 318 with respect to the distributor head 314 between an extended position, as exemplified in FIG. 30 , and a retracted position, as exemplified in FIG. 29 . The exemplified hook actuator system 316 includes a hook carriage 320 to which the receptacle hook 318 is attached. A drive belt 344 is attached to the hook carriage 320 by a screw and bracket indicated at 322. Drive belt 344 is carried on a drive wheel 334 and idler wheels 336, 338, 340, 342. Although exemplified using a drive belt-based system, it is understood that other mechanisms, such as screw-drive systems and linear piston actuators, are equally suited for the hook actuator system.

Referring to FIG. 31 , which is a prospective of an opposite side of the distributor head 314, a drive belt motor 370 having a rotary encoder 372 is attached to the distributor head 314. Drive belt motor 370 is coupled to the drive wheel 334 that drives the drive belt 344 of the hook actuator system 316.

The hook actuator system 316 can include a belt tensioner 346 for maintaining proper tension in the belt 344. Belt tensioner 346 includes a pivoting idler wheel bracket 348 to which idler wheel 336 is attached and which is pivotally attached to the distributor head 314 by a pivot screw 352. A slot 350 is formed in an end of the pivoting idler wheel bracket 348, and a position lock screw 354 extends through the slot 350 into the distributor head 314. A spring 356 bears against a portion of the pivoting idler wheel bracket 348. Tension in the belt 344 can be adjusted by loosening the position lock screw 354, thereby allowing the spring 356 to pivot the pivoting idler wheel bracket 348 and thus urge the idler wheel 336 upwardly to create the proper tension in the drive belt 344. When proper tension is achieved in the drive belt 344, the position lock screw 354 can thereafter be retightened.

The hook carriage 320 includes a rail channel 324 that translates along a hook carriage guide rail 330 attached to an upper, internal portion of the distributor head 314. The receptacle hook 318 is attached to a mount 326 disposed between the rail channel 324 and the hook 318.

A hook home sensor, e.g., a slotted optical sensor or limit switch, may be provided to indicate when the hook 318 is in the retracted, or “home,” position when a sensor flag extending from the mount 326 extends into the slotted optical sensor. Other types of sensors may be used for indicating a home position, such as proximity sensors, magnetic sensors, capacitive sensors, etc. The receptacle hook 318 and hook carriage 320 are operatively coupled for electronic communication with the remainder of the rotary distributor 312 by means of a flexible cable 366 attached at one end to the hook carriage 320 and at a printed circuit board or other connector located on the distributor head 314. Strain reliefs 368 and 369 may be provided for securing the flexible cable 366 to the distributor head 314 and the hook carriage 320, respectively.

FIG. 32 illustrates a manner in which a reagent pack 760 may be transported within the module 400 by means of the rotary distributor 312. As shown in FIG. 32 , the rotary distributor 312 may be configured to receive and hold a reagent pack 760 that is pulled into the distributor 312 by the manipulating hook of the rotary distributor 312 with the bottom edge 765 of the pack 760 supported on a rail 373 formed on the inner walls of the distributor 312.

Similarly, FIG. 33 illustrates a manner in which an MRD 160 may be transported within the module 400 by the rotary distributor 312. As shown in FIG. 33 , the rotary distributor 312 may be configured to receive and hold an MRD 160 that is pulled into the distributor 312 by the manipulating hook of the rotary distributor 312 with the connecting rib structure 164 of the MRD 160 supported on a rail 373 formed on the inner walls of the distributor 312.

The receptacle distribution system 200 includes a distributor moving device configured to move the distributor head 314 in a circular path or in a vertical, linear path. More specifically, in one exemplary embodiment, the distributor moving device includes a rotary drive system 212 configured to move the distributor head 314 in a circular path and an elevation system 230 configured to move the distributor head 314 in a vertical direction.

Details of an exemplary rotary drive system 212 are shown in FIGS. 27, 28, 34 , and 35. Although in certain embodiments, it is contemplated that the rotary drive system 212 is configured to freely rotate in 360°, it is understood that in at least certain embodiments the rotary drive system 212 is configured to rotate 180° between the two respective loading positions.

The first upright wall 218 and the second upright wall 220, on which the distributor head 314 is supported, are mounted onto a turntable 214 that is mounted for rotation about its central axis on the bottom panel 208 of the frame 202. A motor 222, attached to the bottom panel 208 and having a rotary drive 224, such as a rotary drive gear, extending above the bottom panel 208, engages peripheral teeth of the turntable 214 so that powered rotation of the motor 222 effects rotation of the turntable 214, as well as the first and second upright walls 218, 220 and the distributor head 314 supported thereon. Although exemplified as having teeth configured to engage each other, it is understood that the rotary drive 224 and the turntable 214 can engage each other without having teethed parts. In such an embodiment, both the rotary drive and the turntable can be wheels with rubberized outer surfaces to facilitate traction. Rotary motor 222 is preferably a stepper motor for providing precise control of the rotation of the turntable 214 and preferably includes a rotary encoder 223 for providing rotational position feedback to a control system controlling the rotary motor 222. Other means for rotationally coupling the distributor head 314 to the motor 222 are encompassed within this disclosure and include, for example, belt(s) and pulley(s), gear trains comprising one or more gears, drive shafts and worm gears, etc.

As shown in FIG. 35 , a positional sensor 226, which may comprise a slotted optical sensor including an optical transmitter-receiver pair, provides a rotational position feedback signal of the turntable 214. Optical sensor 226 may be configured to detect a passing of one or more positional flags on the turntable 214 for indicating one or more specific rotational positions. Sensor 226 includes prongs, or portions, located above and below the turntable 214 and thus the positional flag(s) may comprise one or more openings (e.g., 227) formed through the turntable. Passage of an opening between the portions of sensor 226 located above and below the turntable 214 complete the optical signal transmission between the transmitter and receiver portions of the sensor 226 and thus generate a signal corresponding to the passage of the opening. Other types of sensors may be used for indicating particular rotational positions, including proximity sensors, magnetic sensors, capacitive sensors, etc.

A second optical sensor 228 may be provided below the turntable 214. Sensor 228 may comprise a slotted optical sensor including an optical transmitter-receiver pair for detecting the passage of one or more sensor flags (not shown) extending beneath the turntable 214 for indicating a rotational position. Other types of sensors may be used for indicating a home position, including proximity sensors, magnetic sensors, capacitive sensors, etc.

Details of a distributor elevation system 230 are shown primarily in FIG. 35 . The depicted elevation system 230 includes a threaded rod 232 extending upwardly from the turntable 214 through a motor 234 and internal thread drive 236 mounted to the distributor head 314 (see also FIG. 31 ). Rotation of the internal thread drive 236 by the motor 234 causes the motor and the distributor head 314 to which it is attached to translate up or down the threaded rod 232. A guide rail 238 extends vertically up one edge of the second upright wall 220, and the motor 234 is coupled to the guide rail 238 by a rail coupling 240. Alternatives to the threaded rod and the internal thread drive for moving the distributor head 314 vertically are encompassed in this disclosure and include, for example, a rack and pinion or a belt drive system.

Referring to the embodiment of FIGS. 27, 28, and 34 , a sensor 246 extends below the distributor head 314. As the distributor head 314 is lowered by the elevation system 230, separate prongs of the sensor 246 extend into openings 216 formed in the turntable 214. Sensor 246 may be a slotted optical sensor with the prongs thereof forming a transmitted-receiver pair. An optical signal between the spaced prongs is broken when the prongs enter the openings 216, thereby sending a signal to a control system that the distributor head 314 is at its lowermost position. Other types of sensors may be used for indicating a down position for the distributor head 314, including, for example, proximity sensors, magnetic sensors, capacitive sensors, etc.

Data and power are communicated between the rotary distributor 312 and the module 400 by means of a coiled cable 244 that can accommodate rotation of the rotary distributor 312 with respect to the frame 202 by, for example, 180° in either direction.

To transfer an MRD 160, the distributor head 314 is rotated a few degrees by the rotary drive system 212 of the rotary distributor 312, the hook 318 is extended by the hook actuator system 316, and the head 314 is rotated in an opposite direction to engage the manipulating structure 166 of the MRD 160. The distributor hook 318 is then retracted, and the MRD 160 is coupled to the distributor head 314. Similarly, to transfer a reagent pack 760, the distributor head 314 is rotated a few degrees by the rotary drive system 212, the hook is extended by the hook actuator system 316, and the head 314 is then rotated in the opposite direction to engage the manipulating hook 764 of the reagent pack 760. The distributor hook 318 is then retracted, and the reagent pack 760 is pulled into the distributor head 314.

Receptacle Handoff Device

The receptacle handoff device 602 is configured to transfer a receptacle, such as the MRD 160, between the receptacle distributor 150 of the first module 100 and the rotary distributor 312 of the second module 400. Both the receptacle distributor 150 of the first module 100 and the rotary distributor 312 of the second module 400 manipulate the MRD 160 using a hook or other similar device to engage the manipulating structure 166 of the MRD 160. Therefore, after the MRD 160 is disengaged by the receptacle distributor 150 of the first module 100, the MRD 160 is positioned and oriented in such a manner as to present the manipulating structure 166 to the rotary distributor 312 of the second module 400. The handoff device 602 performs this function.

Details of the handoff device 602 are shown in FIGS. 27, 28, 39, 40 . The receptacle handoff device 602 comprises a receptacle yoke 604 configured to receive and hold an MRD 160 placed into the yoke 604 by the receptacle distributor 150 of the first module 100. The yoke 604 is mounted on a handoff device bracket 606, attached to and extending from the bottom panel 208 of the frame 202, so as to be rotatable about a vertical axis of rotation. In one exemplary embodiment, the yoke 604 is coupled to a handoff device motor 680 attached to the bracket 606. Motor 680 may be a stepper motor for precise motion control and may include a rotary encoder 682 for providing rotational position feedback of the receptacle yoke 604 to a controller. A sensor 684, which may be a slotted optical sensor comprising an optical transmitter-receiver pair, is mounted to the bracket 606 and detects a home flag 686 extending from the yoke 604 for providing rotational position feedback. Other types of sensors may be used for providing position or orientation feedback, including proximity sensors, magnetic sensors, capacitive sensors, etc. After the MRD 160 is placed in the yoke 604 by the receptacle distributor 150 of the first module 100 and the receptacle distributor 150 disengages the MRD 160, the housing 604 is rotated to present the manipulating structure 166 of the MRD 160 to the rotary distributor 312 of the second module 400.

Alternatively, the handoff device 602 may be passively actuated by the rotary distributor 312. For example, the handoff device rotation may be tied to the rotation of the rotary distributor 312 (e.g., via a cable, belt, gear, or other means) such that when the rotary distributor 312 rotates to the handoff position, the handoff device 602 would spin around to face the rotary distributor 312. When the rotary distributor 312 rotates away from the handoff device 602, the handoff device 602 would rotate back toward the receptacle distributor 150 of the first module 100.

MRD Storage Station

As shown in FIG. 14 , the MRD storage stations 608, 610, 612 are located on the receptacle processing deck 600 of the second module 400 and serve as temporary locations for MRDs in the second module 400. Storage stations 608, 610, 612 include a number of slots 614, each configured to receive an MRD 160. The storage stations 608, 610, 612 are arranged in an arc, thereby accommodating the rotational path of motion of the rotary distributor 312. Providing additional storage for MRDs within second module 400 provides the advantage of enhancing workflow by permitting flexibility in the timing that any particular MRD, or contents thereof, is/are utilized within second module 400. This permits MRDs that may arrive in second module 400 later to be processed out of order, for example, to address urgent needs in a laboratory.

Although exemplified as having three MRD storage stations 608, 610, 612, it is understood that embodiments can be constructed having two or more such storage stations. Similarly, although exemplified as being configured in an arc arrangement, it is understood that the distributor 312 in certain embodiments does not rotate about an arc and that the arc arrangement is convenient for the rotary distributor 312 embodiment. To the extent that an alternate configuration of the distributor 312 is implemented, the MRD storage stations similarly would match the alternate arrangement to maximize workflow of the system.

Magnetic Elution Slots/Reagent Pack Loading Stations

The magnetic elution slots 620 (two in the illustrated embodiment) and the reagent pack loading stations 640 are supported on a bracket 642 attached to frame 202. The purpose of each magnetic elution slot 620 is to hold an MRD 160 and apply magnetic force to the contents of the MRD to pull the magnetic beads to the side walls of each receptacle 162 while the substance transfer pipettor 410 aspirates the eluate fluid from the receptacles 162.

Details of the magnetic elution slots 620 and the reagent pack loading stations 640 are shown in FIGS. 36-38 . Each magnetic elution slot 620 comprises a block 622 within which is formed a slotted opening 624. An MRD 160 placed within the slotted opening 624 is supported within the opening 624 by the connecting rib structure 164 of the MRD 160 resting on the top of bracket 642. The manipulating structure 166 extends out of the opening 624, and a cutout 632 in each side wall of the block 622 enables the hook 318 of the rotary distributor 312 to move laterally into or laterally out of the MRD manipulating structure 166 of an MRD 160 located within the slotted opening 624. The top of the MRD is uncovered, thus enabling pipettor access to the receptacles 162 of the MRD 160 held within the elution slot 620. Magnets 628 are attached to or embedded within one or both walls defining the slotted opening 624. Individual magnets 628 may be provided for each receptacle 162 of the MRD 160, as shown in FIGS. 37 and 38 , or a single magnet may be provided for a receptacle that comprises one or more individual receptacles.

The reagent pack loading stations 640 are defined by spaced-apart, hold-down features 644 extending above the bracket 642 and a backstop 646 defining a back end of each reagent pack loading station 640. A reagent pack 760 is inserted between the hold-down features 644, under a lateral flange, and is pushed into the loading station 640 until the back end of the reagent pack 760 contacts the backstop 646. Reagent Pack Trash Chute

A reagent pack trash chute 428 is supported on the bracket 642. In an exemplary embodiment, reagent pack trash chute 428 includes an entrance structure, defined by side walls 434, 436 and a top panel 438, through which a reagent pack 760 is inserted into the trash chute 428. Sidewalls 434, 436 are attached to the top of the bracket 642 and are bent or flared outwardly at their forward edges to provide a funneling entrance to the trash chute 428. Resilient tabs 442 extend down from the top panel 438.

To discard a reagent pack 760, the rotary distributor 312 inserts the pack 760 into the trash chute 428 between the side walls 434, 436. When the reagent pack 760 is inserted into the trash chute 428, there is a clearance between the top panel 438 and the top of the reagent pack 760. The resilient tabs 442 bear against the top of the reagent pack 760 and hold the reagent pack 760 down within the trash chute 428. The angle the resilient tabs 442 permits the reagent pack 760 to be pushed into the of the trash chute 428, but resists movement of the reagent pack 760 out of the trash chute.

When a subsequent reagent pack 760 is inserted into the reagent pack trash chute, it is pushed against the reagent pack 760 previously inserted into the trash chute 428, thereby pushing the previously-inserted pack further into the trash chute 428. A cut-out 648 is formed in the bracket 642, so the previously-inserted pack 760 eventually falls from the trash chute 428 and, guided by a guide ramp 444 extending down from the bracket 642, into a trash bin located below the trash chute 428.

Reagent Pack Changer

Details of an exemplary reagent pack changer 700 are shown in FIGS. 15-17 . The purpose of the reagent pack changer 700 is to provide fully independent reagent pack loading and test execution whereby an operator may place reagent packs in a reagent pack input device and/or remove reagent packs 760 from the reagent pack input device while previously loaded reagent packs 760 are stored within a storage compartment, which may be temperature controlled, and are available for access by the instrument independently of the status of the reagent pack input device. The reagent pack changer is configured to move reagent packs 760 between the reagent pack input device and the storage compartment.

As shown in FIGS. 15-17 , in one exemplary embodiment, the reagent pack input device comprises a reagent pack carousel compartment 702 which may be pulled open from the second module 400 and which contains a rotatable reagent pack carousel 704. The pack carousel 704 includes a number of reagent pack stations 706, each of which is adapted to receive and carry a reagent pack 760 and which are defined by radially inner dividers 708 and radially outer dividers 710. As can be seen in FIGS. 15-17 , the reagent pack stations 706 of the reagent pack carousel 704 are arranged about the outer perimeter of the reagent pack carousel 704, but the elongated reagent pack stations 706, and reagent packs 760 carried thereby, are not oriented in a radial direction with respect to the center of the reagent pack carousel 704. Each reagent pack station 706 is oriented at an angle (e.g. 5-20°) with respect to a true radial orientation. This configuration of reagent packs optimizes the placement of reagent packs 760 on the carousel 704, thereby enabling the reagent pack carousel 704 to carry the maximum number of reagent packs 760 and providing access of identifiable indicia present on each reagent pack 760 to the barcode reader 774.

A gap 712 between each inner divider 708—outer divider 710 pair enables an operator to insert his or her fingers into the gap 712 to thereby grasp the sides of the reagent pack 760 for placing the reagent pack 760 into the reagent pack station 706 or for removing the reagent pack 760 from the reagent pack station 706. Each reagent pack station 706 of the reagent pack carousel 704 also includes an alignment block 714 at a radially inner end of the reagent pack station 706. The alignment block within the rear recess 770 of the reagent pack 760 helps to maintain the proper alignment and position of the reagent pack 760 within the reagent pack station 706.

In some embodiments, the reagent pack carousel compartment 702 includes a carousel frame 716, preferably disposed on a track that enables the frame 716 to be slid into or out of the module 400 as a drawer. The frame 716 includes a drawer front 720. The reagent pack carousel 704 is rotatably disposed within the frame 716, which may include a circular recess 722 shaped so as to conform to the reagent carousel 704.

The reagent pack carousel 704 is motorized to effect powered rotation of the carousel. In one exemplary embodiment, the reagent pack carousel compartment 702 may include a motor (not shown) that is coupled, for example by a belt and pulley arrangement (not shown), to the reagent pack carousel 704 for powered rotation of the reagent pack carousel 704. The motor may be mounted to the reagent pack carousel frame 716 and move in and out with the reagent pack carousel compartment 702, connected to the module 400 by a flex cable. The reagent pack carousel compartment 702 may include one or more position sensors for detecting when the carrousel is in an open or closed position and communicating a corresponding signal to the system controller. Such sensor(s) may include optical sensors, proximity sensors, magnetic sensors, capacitive sensors, etc.

The reagent pack carousel compartment 702 may also include a software-controlled lock.

The reagent pack carousel compartment 702 can also include one or more sensors for tracking the positions of the reagent pack station 706. For example, the reagent pack carousel 704 may include a home flag, such as a tab and an optical sensor that detects the position of the tab at a specified rotational position of the reagent pack carousel 704. Other types of sensors may be used for indicating a home position, including proximity sensors, magnetic sensors, capacitive sensors, etc. Furthermore, the motor driving the reagent pack carousel 704 may be a stepper motor including a rotary encoder for generating signals corresponding to a rotational position of the reagent pack carousel 704.

The second module 400 may include a machine pack reader configured to read a machine code provided on each reagent pack 760 providing information regarding the reagent pack 760, such as the identity of the assay reagents carried within the reagent pack 760, manufacturer, lot number, expiration date, etc. The machine code may also include a unique identifier specifically identifying that particular reagent pack 760. The machine code reader device may comprise a barcode reader 774 configured to read a barcode label 772 disposed on the reagent pack 760. Barcode label 772 may be a two dimensional or one dimensional barcode. A scanning slot 718 formed in the carousel frame 716 provides an opening through which the barcode reader 774 may read a label 772 on the reagent pack 760. Similarly, the orientation of the reagent pack 760 carried in the pack station 706 of the pack carrousel 704, may be set at an angle with respect to a true radial orientation, and the shape of the outer dividers 710, being generally trapezoidal in shape, creates a clearance opening through which the barcode reader 774 can read the barcode label 772 disposed on the reagent pack 760. Together with the rotary encoder, the barcode reader 772 provides an indication where each reagent pack 760 is positioned within each reagent pack station 706 of the reagent pack carrousel 704. Although a barcode scanner is exemplified, the use of other technologies such as RFID and QR codes are contemplated.

Each reagent pack station 706 may include a station empty barcode disposed on a side of each outer divider 710 that will be read by the barcode reader 774 if a reagent pack 760 is not positioned within the reagent pack station 706. In another exemplary embodiment, the reagent pack input device comprises an alternative reagent pack carousel 730 shown in FIG. 18 . Reagent pack carousel 730 is not carried on drawer be pulled out of the module 400, but instead, includes radially oriented reagent pack stations 732 arranged about the perimeter of the reagent pack carousel 730 and is accessible through a slot in front of the second module 400 which may be covered by a door that is openable by the operator. Powered rotation of the reagent pack carousel 730 may be provided by a carousel drive system that may include a motor 734 having an output drive wheel 736 that is coupled to a drive pulley 739 of the carousel 730 by means of a drive belt 738. Motor 734 may comprise a stepper motor having a rotary encoder, and a home flag may be provided on the carousel 730 to detect and monitor the rotational position of the reagent pack carousel 730 and thus each reagent pack station 732.

FIG. 18 also shows an exemplary embodiment of a reagent pack storage compartment represented by reference number 740. The storage compartment 740 is disposed beneath the reagent pack carousel 730. In the embodiments described above, the reagent pack carousel compartment 702 would be disposed within the module 400 above the storage compartment 740 and would be movable with respect thereto.

In some embodiments, storage compartment 740 includes a housing 742 that defines a temperature controlled chamber therein. The desired storage temperature may be as low as 4° C., but could be any temperature at or below ambient temperature, for example, 15° C. In some embodiments, the chamber of the storage compartment 740 further has a humidity control module configured to control the humidity level of the air circulating within the temperature controlled chamber. As part of this process, the humidity control module is optionally equipped to collect condensed water, and route it outside the cooled storage area for disposal. Housing 742 may be insulated and may be cooled by Peltier devices that can be mounted directly onto the housing 742 or by Peltier devices coupled to a heat cools a fluid, such as water or a refrigerant, which is circulated around the housing 742. In one embodiment the storage compartment 740 is cooled by two separate Peltier devices mounted directly onto the housing 742, each at different temperatures or temperature ranges. In this embodiment the first Peltier device is held at a temperature close to the freezing temperature of water. The second Peltier device is provided at a location within the storage compartment 740 distant or adjacent to that of the first Peltier device and is provided at a temperature higher than that of the first Peltier device, e.g., 15° C. The second Peltier device is in operable communication with a temperature sensor within the storage compartment 740, positioned near the top of the storage compartment 740. The second Peltier device would operate based on the measured temperature to maintain a predetermined temperature in the storage compartment 740. In this embodiment a fan may be provided within the storage compartment 740 to cause air circulation within the storage compartment 740 through the fan, and past the first and second Peltier device s. When air passes the first Peltier device , which is held at a very low temperature, the air will cool, thus decreasing its capacity to hold moisture which moisture will condensate on the Peltier device or another designated element. Therefore, this dual Peltier device embodiment provides both a temperature and humidity controlled environment, which is beneficial for increasing the shelf-life of lyophilized reagents which are vulnerable to rapid degradation in the presence of increased temperatures and atmospheric moisture.

Other ways to cool and/or dehumidify the storage compartment 740 are contemplated and the disclosure is not limited to the exemplified embodiments.

The housing 742 should be provided with a liquid collection and/or drainage system for handling condensing liquid inside the housing 742. Such a system may, for example, include piping for directing the collected condensate away from the housing 742 and to a drain or an evaporator.

A storage carousel 744 is rotatably mounted within the housing 742, for example, on shaft 745. Storage carousel 744 includes a plurality of pack stations 746 disposed around the perimeter thereof and positioned on one or more levels of the carousel 744. In the illustrated embodiment, storage carousel 744 includes pack stations 746 on two levels, one above the other.

A carousel drive can power rotation of the storage carousel 744 within the storage compartment 740. The carousel drive may include a motor 748, which may be a stepper motor, having an output drive wheel 750 coupled by means of a drive belt 752 to a drive pulley 749 of the pack carousel 744. Motor 748 may be located outside the housing 742—to keep heat generated by the motor 748 from heating the storage compartment 740—and the drive belt 752 may extend through an opening in the housing 742. Alternatively, a drive pulley coupled to the carousel 744 may be located outside the housing 740. The motor 748 may include a rotary encoder, and the reagent pack carousel 744 may include a home flag for monitoring the rotational position of each of the reagent pack stations 746 of the pack carousel 744.

Operation of the reagent pack changer 700 will now be described.

After the reagent packs 760 are placed in the reagent pack carousel 704 or reagent pack carousel 730 of the pack input device, the barcode of each reagent pack 760 is read by a barcode reader 774 and the identity and other information provided by the barcode is associated with a particular reagent pack station 706,732 of the reagent pack carousel 704. Alternatively, the reagent packs 760 may be scanned externally of the module 400, for example, by a hand operated barcode scanner, before the reagent pack 760 being placed into the pack input device.

After reagent packs 760 have been placed into the reagent pack input device, such as reagent pack carousel 704 or reagent pack carousel 730, pack carousel compartment 702 is shut or a door in front of the carousel access opening is closed. Next, the rotary distributor 312 removes one or more reagent packs 760 from the reagent pack carousel 704, 730 and moves the reagent pack 760 into a pack station 746 of the storage carousel 744 of the storage compartment 740. As shown in FIG. 16 , the carousel frame 716 of the reagent pack carousel compartment 702 includes a reagent pack access slot 724 through which the rotary distributor 312 can access the manipulating hook 764 of a reagent pack 760 disposed within the reagent pack station 706. To enable the rotary distributor 312 to transfer reagent pack 760 between the reagent pack input carousel 704 or 730, to the one or more levels of the storage carousel 744 of the storage compartment 740, the rotary distributor 312 provides powered and controlled vertical, i.e., z-axis, motion. It is preferable that access to the reagent pack access slot 724 by the rotary distributor 312 is controlled by a door when the reagent carousel 704 or 730 is temperature controlled.

Once a reagent pack 760 is present in the storage compartment 740, it is available to be utilized in an amplification assay, for example, a PCR assay. When a sample is present requiring a particular assay, the carousel of the storage compartment 740 rotates to a position where a reagent pack 760 containing the specific unit dose reagents for that particular assay are accessible by the rotary distributor 312. Generally, such access will be through a door to maintain a tightly controlled temperature environment in the storage compartment 740. The distributor 312 will access the reagent pack 760 through the door and move it to a reagent pack loading station 640 for reconstitution of one or more lyophilized reagents contained on the reagent pack 760. When the reagent pack 760 is empty, or when the reagents of one or more wells on the reagent pack 760 have been reconstituted and removed, the distributor 312 will again move the reagent pack 760. If there are reagents remaining in the reagent pack 760, the distributor 312 will transfer the reagent pack 760 back to the storage compartment 740. If the reagent pack 760 contains no more reagents, or is otherwise designated as inappropriate for continued use (e.g., contaminated or expired reagents), the distributor 312 will transfer the reagent pack 760 to either a waste chute 426 or back to the reagent pack input carousel 704 or 730 for removal.

A further alternative for scanning each reagent pack 760 is for the distributor 312 to present each reagent pack 760 to a barcode scanner as each reagent pack is removed from the reagent pack input carousel and before placing the reagent pack 760 into the storage carousel 744.

Reagent identity control is maintained after the bar code (or other machine code) is read on the reagent pack 760 by monitoring the position of each reagent pack station 706, 732 of carrousel 704, 730 and each reagent pack station 746 on the storage carrousel 744 and associating the reagent pack 760 identity—from the bar code—with the reagent pack station position.

The reagent pack carousels 704, 730 rotate independently of the storage carousel 744 of the storage compartment 740 to allow an operator to load and unload reagent packs 760 from the reagent pack carousel 704, 730 while the module 400 (i.e., rotary distributor 312) independently accesses reagent packs 760 stored in the storage carousel 744 for assay processing.

The reagent pack changer 700 preferably stores at least 28 to 30 or more reagent packs 760.

The second module 400 may further include an electrostatic generator to impart an electrostatic charge for positioning and holding the lyophilized reagent 768 present in the reagent pack 760 at the bottom of each of the mixing wells 762 of the reagent pack 760. Though the reagent 768 may be held at the bottom of the associated mixing well 768 with a previously-imparted electrostatic charge, as noted above, the inclusion of a mechanism, such as a electrostatic generator, to actively pull the lyophilized reagent 768 down to the bottom of the mixing well 762 at the time that the reagent is reconstituted will ensure its positioning in the correct spot in the mixing well during reconstitution. In an embodiment, the electrostatic generator is positioned below the reagent pack loading station 640, 730. Alternatively, or in addition, an electrostatic generator could be provided in the reagent pack carousel 704, 730 present in the reagent pack loading drawer and/or the storage carousel 744 present in the storage compartment 740. In such an embodiment, the electrostatic generator may be located under or operatively coupled to the reagent pack station 706, 732 or the reagent pack station 746 below the reagent pack 760, as providing an electrostatic generator within the storage compartment 740 will have an enhanced electrostatic effect due to the lower temperature and low humidity.

Storage/Expansion Module

Details of compartment 590 for storing accessories or to accommodate possible expansion of the second module 400 are shown in FIGS. 5, 6, 14, and 15 . In one exemplary embodiment, compartment 590 can house a standard 96 well plate. The plate is located such that both pipettor arms 408, 416 can access the 96 well plate location. The expansion space has access to the front (via a drawer mechanism) so that the operator can load and unload the plate. The expansion space can also be accessed from the side of the instrument. A drive system comprising, for example, a motor-driven belt, may be provided for translating a well plate or other container or component into or out of the second module 400. Compartment 590 can be utilized as an area for collecting cap/vial assemblies that have undergone a PCR and/or melting assay to provide for the ability to perform additional assays (e.g., ELISAs) on the sample contained in the cap/vial assembly. (A procedure for performing a thermal melt analysis is disclosed by Wittwer et al. in U.S. Pat. No. 8,343,754.) In certain embodiments an arrangement of cap/vial assemblies in the format of a 96 well plate has advantages if further processing of the samples is desired since the 96 well plate size is compatible with a variety of known sample processing and molecular assay instruments.

Instrument Theory of Operation

The first module 100 is used for the sample preparation portion of the amplification assay (i.e., minimally the steps for isolating and purifying a target nucleic acid that may be present in a sample). Samples and TCR, which may include a magnetically-responsive solid supports, are loaded onto the first module 100. Elution buffer containers 502, 504 are loaded on the second module 400. The second module 400 then automatically moves these containers into a space within the first module 100 that can be accessed by a substance transfer device, for example, a reagent pipettor (not shown in FIG. 1 ), of the first module 100. Through information provided to the first module 100 by, for example, an operator via a user interface or through automated, machine-readable information, such as a bar code, provided on the sample container (not shown in FIG. 1 ), the first module recognizes that a particular amplification assay will be initiated. To process samples, the receptacle distributor 150 of the first module 100 pulls a new MRD 160 from an input queue 102 and places it into a sample dispense position within the first module 100. TCR and sample are transferred from a reagent container and sample tube, respectively, to each receptacle 162 the MRD 160 by a pipettor within the first module 100. The contents of the MRD 160 are then incubated for a prescribed period at a prescribed temperature before the MRD 160 is transferred to a magnetic separation wash station 118, 120 for a magnetic wash procedure.

After the target capture process, the MRD 160 is moved by the receptacle distributor 150 to an amplification reagent dispense position in the first module 100. The substance transfer device of the first module 100 then adds elution fluid to each receptacle 162 of the MRD 160 to separate target (sample) material from the magnetic particles, and the first module 100 mixes the contents of each receptacle 162 before sending the MRD 160 to the second module 400. The second module 400 places the MRD 160 into one of a series of slots configured to hold MRD 160. When signaled by the system controller, the second module 400 moves the MRD 160 to a magnetic elution slot 620 to separate the eluted nucleic acid material from the magnetic particles. The substance transfer device 402, for example, a robotic pipettor, then initiates the amplification process. The pipettor 402 first dispenses oil to all processing vials 464, 670 queued for use in testing. The pipettor 402 then aspirates eluate/sample from the MRD 160, and then aspirates a reconstitution reagent solution from a reconstitution reagent cartridge or reservoir, dispensing them into a lyophilized-reagent well of reagent pack 760. The reconstitution reagent and a lyophilized amplification reagent in the reagent well of reagent pack 760 may be drawn into and released from the pipette tip one or more times to ensure adequate and rapid reconstitution. The reconstituted amplification reagent is pipetted to the processing vial 464, 670 and is then capped. The reconstituted amplification reagent, sample, and oil may be drawn into and released from the pipette tip one or more times to ensure adequate mixing. The capped vial 464, 670 is transferred to the centrifuge and then to the thermal cycler 432, such as thermal cycler 432 for PCR amplification and fluorometric detection.

Results may be displayed on an instrument monitor or user interface and either printed or communicated to the LIS.

In an embodiment, the first module 100 is configured to perform one or more isothermal nucleic acid amplification reactions on nucleic acid material contained within an MRD 160. In one embodiment, such an isothermal process may be performed on the contents of the MRD 160 before transporting the MRD 160 to the second module 400 to perform PCR on a portion of the MRD content material, as discussed above. Alternatively, after the MRD 160 is processed in the second module 400 and an amount of eluate/sample is transferred from the MRD to one or more vials 464, 670 for performing PCR or other process(es) that the second module 400 is configured to perform. The MRD 160 may be transported back to the first module 100 to perform an isothermal nucleic acid amplification reaction on the remaining contents of the MRD 160.

Exemplary Processes

Details of operation and a process embodying aspects of the present disclosure are shown in the flow charts of FIGS. 41-43 . The following processes are exemplary. Other processes may be performed and/or the processes shown herein and described below may be modified, e.g., by omitting and/or reordering certain steps.

A sample eluate preparation process that can be performed using the first module 100 and the second module 400 described above is represented by flow chart 800 in FIG. 41 . In step S802 of method 800, a reaction receptacle is moved to a location at which reaction materials can be added to the receptacle. See, e.g., Clark et al. in U.S. Pat. No. 8,309,036. For example, the receptacle distributor 150 of the first module 100 moves an MRD 160 from the input device 102 to one of the load stations 104, 106 or 108. See, e.g., Hagen et al. in U.S. Patent Application Publication No. 2012/0128451.

In step S804 a substance transfer device of the first module 100 transfers reaction materials to the receptacle. See, e.g., Buse et al. in U.S. Provisional Application No. 61/783,670. For example, a robotic pipettor of the first module 100 transfers a target capture reagent (“TCR”) (e.g., 500 μL), sample fluid (e.g., 360 μL), and target enhancer reagent (“TER”) (e.g., 140 μL) into each receptacle 162 of the MRD 160.

In step S806, the reaction materials added to the receptacle in step S804 are mixed. For example, the TCR, sample fluid, and TER added to the receptacles 162 of the MRD 160 are mixed by, for example, oscillating the MRD 160 at a high frequency (e.g., 60 seconds at 16 Hz).

In step S808, the receptacle is moved into an environment that will promote the desired reaction. For example, the receptacle distributor 150 removes the MRD 160 from the load station 104 and transfers the MRD 160 to one of the incubators 112, 114, 116 (referred to as the AT Binding Incubator “ATB Incubator” in FIG. 41 ) to incubate the contents of the MRD 160 at a prescribed temperature for a prescribed period of time (e.g., 1800 seconds at 63° C.). Before moving the MRD 160 to an incubator, the MRD 160 may first be placed in one of the temperature ramping stations 110 (e.g., 300 seconds at 65° C.) to elevate the temperature of the MRD 160 and its contents to a temperature that is closer to that of the incubator into which the MRD 160 will be transferred so as to minimize temperature fluctuations within the incubator.

The desired reaction may require two or more incubations at different temperatures. Thus, in accordance with one implementation of the disclosure, in step S810, the receptacle distributor 150 removes the MRD 160 from one of the incubators and transfers the MRD 160 to another incubator (referred to as the “High Temp Incubator” in FIG. 41 ) that is at a different (e.g., higher or lower) temperature than the first incubator to continue to incubate the contents of the MRD 160 at a prescribed temperature for a prescribed period of time (e.g., 600 seconds at 43.7° C.).

In step S812, the receptacle distributor 150 removes the MRD 160 from the second temperature incubator and returns the MRD 160 to another incubator at a different temperature, which may be the same incubator (e.g., the “ATB Incubator”) the MRD 160 was placed into in step S808.

At the conclusion of the incubation step(s), it may be desirable to cool the temperature of the contents of the receptacle, for example to terminate any reaction occurring within the receptacle. Thus, in one example, in step S814, the receptacle distributor 150 may remove the MRD 160 from the incubator and transfer the MRD 160 to a chiller module 122 (referred to as a “Chiller Ramp” in FIG. 41 ), maintained at a predetermined temperature.

Next, assuming the reaction performed within the receptacle includes immobilizing a target nucleic acid on a magnetic-responsive solid support, a magnetic separation procedure is performed on the contents of the receptacle. Thus, in step S816, the receptacle distributor 150 removes the MRD 160 from a chiller module 122 after a predetermined period of time (e.g., 830 seconds), and transfers the MRD 160 to a magnetic parking station comprising magnets for attracting magnetically-responsive solid support within each receptacle 162 to the walls of the receptacles 162 to pull the solid support out of suspension. See, e.g., Davis et al. in U.S. Pat. No. 8,276,762. In step S818, after a prescribed period of time within the magnetic parking station (e.g., 300 seconds), the receptacle distributor 150 removes the MRD 160 from the magnetic parking station and transfers the MRD 160 to a magnetic separation wash station 118 or 120. See, e.g., Hagen et al. in U.S. Patent Application Publication No. 2010/0288395. In step S820, a magnetic wash procedure is performed on the contents of the MRD 160 placed into the magnetic wash station 118 or 120. One exemplary embodiment of the magnetic separation procedure involves a number magnetic dwells during which the contents of the receptacle are exposed to a magnetic force for a predetermined period of time, and after each magnetic dwell, while the contents are still exposed to the magnetic force, the fluid contents are aspirated from the receptacle, leaving the magnetic particles behind in the receptacle. In one exemplary embodiment, three magnetic dwells of 120 seconds each are performed. At the conclusion of each magnetic dwell, the magnetic force is removed from the contents of the receptacle. After each magnetic dwell, except the last magnetic dwell, an amount of wash fluid (e.g., 1000 μL of wash buffer) is added to the receptacle to re-suspend the magnetic particles before beginning the next magnetic dwell.

After the magnetic wash process is complete (e.g., after the last magnetic dwell followed by an aspiration of the non-magnetic fluid contents of the receptacle), in step S822, the receptacle distributor 150 retrieves the MRD 160 from the magnetic separation wash station 118 or 120 and moves the MRD 160 to one of the load stations 104, 106 or 108. In the load station, an amount of elution buffer (e.g., 50-110 μL) is transferred by, for example, a substance transfer device such as a robotic pipettor, from one of the elution containers 502, 504 transferred into the first module 100 by the bulk reagent container transport 550 of the bulk reagent container compartment 500 of the second module 400.

In some embodiments, it may be desirable to heat or incubate the contents of the MRD 160 to improve the efficiency of the nucleic acid elution.

In step S824, following the addition of the elution buffer, the contents of the MRD 160 are mixed by agitating the MRD 160.

In step S826, the MRD 160 is transferred from the first module 100 to a magnetic elution slot 620 in the second module 400. First, the receptacle distributor 150 of the first module 100 retrieves the MRD 160 from the load station 104, 106 or 108 and transfers the MRD 160 to an end of the transport track assembly 154 closest to the second module 400. The distribution head 152 of the receptacle distributor 150 places the MRD into the receptacle handoff device 602 of the second module 400. The receptacle handoff device 602 then rotates the MRD 160 and presents it to the rotary distributor 312. The rotary distributor 312 extends its hook 318 and engages the manipulation structure 166 of the MRD 160 by rotating a few degrees to place the hook 318 into the manipulation structure 166 and then withdraws the hook 318 to pull the MRD 160 into the distributor head 314 of the rotary distributor 312. The rotary distributor 312 then rotates to align the MRD 160 carried therein with one of the magnetic elution slots 620 of the second module 400 (or optionally MRD storage 608). The rotary distributor 312 then extends its hook 318 to push the MRD 160 into the magnetic elution slot 620 and rotates a few degrees to remove the hook 318 from the manipulation structure 166.

The process next proceeds to process 830 shown in FIG. 42 .

Referring to FIG. 42 , a reaction mixture preparation process is represented by flow chart 830. One or more of the steps of process 830 may proceed in parallel with one or more of the steps of process 800 shown in FIG. 41 .

At step S832 the substance transfer pipettor 410 of the second module 400 picks up a disposable tip 584 from a disposable tip tray 582 carried in one of the tip compartments 580.

In step S834, the substance transfer pipettor 410 transfers an amount of oil (e.g., 15 μL) from an oil container carried in the bulk reagent container compartment 500 to one or more processing vials 464 held in the cap/vial trays 460 of the processing cap/vial compartment 440.

In step S836, the substance transfer pipettor 410 moves to a trash chute 426 to strip the disposable pipette tip 584 therefrom and discard the tip into the trash chute 426. Substance transfer pipettor 410 then returns to the disposable tip tray 582 and picks up another disposable pipette tip 584.

In step S838, substance transfer pipettor 410 transfers an amount of reconstitution reagent (e.g., 20 μL) from a reconstitution reagent container held in the bulk reagent container compartment 500 to a mixing well 762 of a PCR reagent pack 760 that was previously transferred by the rotary distributor 312 from the storage compartment 740 to a reagent pack loading station 640. In one embodiment, before the reconstitution reagent is dispensed into the mixing well 762, the pipettor 410 performs a level sense at the foil 766 before piercing the foil 766 with the pipette tip 584. The level-sense performed on the foil of the reagent pack 760 to “calibrate” the height of the reagent pack 760 relative to the pipettor. Generally, the pipettor 410 is configured to extend the pipette tip to the bottom of the mixing well for more accurate reagent aspiration.

In step S840, the fluid within the mixing well 762 is mixed to dissolve the lyophilized reagent 768. In one example, the substance transfer pipettor 410 mixes the fluid within the mixing well 762 by alternately aspirating the fluid into the pipette tip 584 and dispensing the fluid back in the well 762 one or more times to dissolve the lyophilized reagent 768.

In step S842, the substance transfer pipettor 410 transfers an amount, (e.g., 20 μL) of the reconstituted reagent from the mixing well 762 of the PCR reagent pack 760 (referred to as “Mastermix” in FIG. 42 ), into a vial 464. A PCR master mix provides the key ingredients necessary for performing PCR in a premixed and optimized format. Included in the master mix are Taq DNA polymerase, deoxynucleoside triphosphates (dNTPs), and magnesium chloride (MgCl₂). Not typically included are the forward and reverse primers.

In step S844, the substance transfer pipettor 410 moves to the trash chute 426 and strips the pipettor tip 584 into the trash chute. The substance transfer pipettor 410 then moves to the disposable tip tray 582 and picks up a new disposable pipette tip 584.

Block “B” in FIG. 42 represents the integration of process 800 shown in FIG. 41 with process 830 shown in FIG. 42 . An MRD 160 containing a sample mixture (which, in this exemplary embodiment, was purified in a magnetic separation procedure) and an elution buffer is held in a magnetic elution slot 620, having been placed there in step S826 of process 800. In one embodiment, the MRD 160 is held in the magnetic elution slot 620 for dwell period of at least 120 seconds.

In step S846 of process 830, the substance transfer pipettor 410 transfers an amount of eluate (e.g., 5 μL) from the MRD 160 held in the elution slot 620 to the processing vial 464 to which oil and reagent were added in steps S834 and S842, respectively.

In step S848, the substance transfer pipettor 410 moves back to the trash chute 426 and strips the disposable pipette tip 584 into the trash chute.

The process now proceeds to process 850 shown in FIG. 43 .

Referring to FIG. 43 , a process for performing an automated biological process, such as a PCR reaction, is represented by flow chart 850. Block “C” in FIG. 43 represents the integration of process 830 shown in FIG. 43 with process 850 shown in FIG. 43 .

In step S852, the substance transfer pipettor 410 picks up a processing vial cap 476 from the cap well 440 of the cap/vial tray 460 by inserting the pipettor probe 422 (without a disposable pipette tip thereon) into the cap 476 (see FIG. 26 , which shows an alternative cap 600 and vial 670 combination). The substance transfer pipettor 410 then picks up the cap 476, which is held onto the pipettor probe 422 by friction, and inserts the cap 476 into the processing vial 464 held in the processing vial well 474 until the cap 476 locks with the vial 464 to form a cap/vial assembly (see FIG. 25 ).

In step S854, the substance transfer pipettor 410 transfers the cap/vial assembly held to the pipettor probe 422 by friction to the centrifuge 588, where a stripping device removes the cap/vial assembly from the pipettor probe 422 to deposit the cap/vial assembly into the centrifuge 588.

In Step 856, following a specified period of time in the centrifuge, the vial transfer pipettor 418 inserts its pipettor probe 422 into the cap 476 of the cap/vial assembly held in the centrifuge 588 and removes the cap/vial assembly from the centrifuge 588 and transfers the cap/vial assembly to an incubator module, such as the thermal cycler 432. A stripping device removes the cap/vial assembly from the pipettor probe 422 of the vial transfer pipettor 418. In step S858, an incubation process is performed. The incubation process may include PCR thermal cycling comprising multiple cycles of temperatures varying between 95° C. for denaturation, 55° C. for annealing, and 72° C. for synthesis. During the thermal cycler process an emission signal from the contents of the processing vial may be monitored. For example, fluorescence monitoring at one or more colored wavelengths during each PCR cycle may be measured using a signal detecting device, such as a fluorometer, operatively integrated with the thermal cycler 432. Periodic fluorescence intensity measurements at each wavelength may be made at regular intervals to generating fluorescence time series data for later processing and analysis.

In step S860, following the PCR process of step S858, the vial transfer pipettor 418 retrieves the cap/vial assembly from the thermal cycler 432 and transfers the cap/vial assembly to a trash chute 424 where the cap/vial assembly is stripped from the pipettor probe 422 into the trash chute 424, or the cap/vial assembly is transported to an output reagent pack 760 in the storage/expansion module.

In some embodiments, diagnostic system 10 can be used to perform two or more assays that include nucleic acid amplification reactions that require different reagents, including one or more unit-dose reagents. FIG. 44 illustrates a method of using diagnostic system 10, which includes first module 100 and second module 400, according to one such embodiment.

At step 862, a plurality of samples is loaded in diagnostic system 10. A first sample subset of the plurality of samples has been designated for at least one assay, and a second sample subset of the plurality of samples has been designated for at least one different assay. In some embodiments, barcodes on the sample receptacles indicate the appropriate assay, and in other embodiments, the assay is entered manually into the system by an operator using a user-interface of diagnostic system 10.

In some embodiments, a first assay comprising a first nucleic amplification reaction has been designated for the first sample subset. For example, the first nucleic amplification reaction can be PCR, and the target nucleic acid can be a nucleic acid associated with a particular virus or organism, for example. In some embodiments, the first nucleic amplification reaction uses a unit-dose reagent stored and operatively accessible within the diagnostic system 10. For example, the first nucleic amplification reaction can be PCR or any other desired thermal cycling reaction that can be performed by second module 400 of diagnostic system 10.

In some embodiments, a second assay comprising a second nucleic amplification reaction will be designated for the second sample subset. The second nucleic amplification reaction may be the same or a different nucleic acid amplification reaction than the first nucleic acid amplification reaction of the first assay, but the reagent used in the second nucleic amplification reaction may target a different nucleic acid than the target of the first reagent used in the first assay in some embodiments. In some embodiments, the second nucleic amplification reaction can be PCR or any other desired thermal cycling reaction that is performed, for example, by second module 400 of diagnostic system 10. In some embodiments, the second nucleic amplification reaction is TMA or any other isothermal reaction that is performed, for example, by first module 100 of diagnostic system 10. The reagent used for the second assay can be a unit-dose reagent different than the unit-dose reagent used for the first assay, a bulk reagent, or both. For example, if the second nucleic amplification reaction is PCR, the second reagent used in the second assay can be a unit-dose reagent, and if the second nucleic amplification reaction is TMA, the second reagent used in the second assay can be a bulk reagent. In some embodiments, the second unit-dose reagent, the first bulk reagent, or both are stored and operatively accessible within diagnostic system 10.

Each of the first and second assays has a temporal workflow schedule associated with the respective assay. In some embodiments, at step 864, the diagnostic system 10 coordinates the schedule for performing the first assay with the schedule for performing the second assay such that use of resources of the diagnostic system is maximized For example, the first assay schedule may require use of one of the substance transfer devices, and the second assay schedule may also require use of the same substance transfer device. Diagnostic system 10 can be configured to shift one or both of schedules such that once the first assay is finished with the substance transfer device, the substance transfer device can be used for the second assay. Such coordination increases throughput and minimizes processing time.

At step 866, diagnostic system 10 performs the first assay on the first sample subset. At step 868, diagnostic system 10 begins to perform the second assay on the second sample subset. Accordingly, diagnostic system 10, which stores and provides operative access to the first unit-dose reagent used in the first assay and at least one of the second unit-dose reagent or the first bulk reagent used in the second assay, performs both steps 866 and 868 according to an embodiment. In some embodiments, step 868 starts while step 866 is being performed—the diagnostic system can simultaneously perform the first assay and the second assay. In some embodiments, during steps 866 and 868 when the respective assays require a unit-dose reagent, for example, for a PCR assay, diagnostic system 10 verifies whether a reagent pack 760 containing the required reagent is positioned at one of the loading stations 640. If not, the distributor system replaces a reagent pack 706 located at the loading station 640 with a reagent pack 760 containing the unit-dose reagent needed for the requested assay. In some embodiments, step 868 starts after step 866 is completed. And in some embodiments, although step 868 can start after step 866, step 868 can be completed before step 866 is completed.

In some embodiments, diagnostic system 10 can alternate between step 866 and 868. For example, diagnostic system 10 can perform the first assay on a first sample of the first sample subset, and then perform the second assay on a first sample of the second sample subset. Diagnostic system 10 can then switch back to step 866 and perform the first assay on a second sample of the first sample subset.

In some embodiments, the first assay and the second assay each comprise preparing the respective sample subsets using a second bulk reagent different than the first bulk reagent that may be used in the second nucleic acid amplification reaction. For example, each sample of the first and second sample subsets can be prepared according to process 800 described above referencing FIG. 41 .

In some embodiments, the first sample subset and the second sample subset comprise different samples. In some embodiments, the first sample subset and the second sample subset comprise the same samples. In such embodiments, multiple assays, for example, the first and second assays explained above, are performed on the same samples.

In some embodiments, steps 866 and 868 are performed without additional equipment preparation (for example, wiping down the equipment of diagnostic system 10), reagent preparation (replacing reagent bottles stored in diagnostic system 10), and consumable preparation (replacing empty tip trays).

Hardware and Software

Aspects of the disclosure are implemented via control and computing hardware components, user-created software, data input components, and data output components. Hardware components include computing and control modules (e.g., system controller(s)), such as microprocessors and computers, configured to effect computational and/or control steps by receiving one or more input values, executing one or more algorithms stored on non-transitory machine-readable media (e.g., software) that provide instruction for manipulating or otherwise acting on the input values, and output one or more output values. Such outputs may be displayed or otherwise indicated to an operator for providing information to the operator, for example information as to the status of the instrument or a process being performed thereby, or such outputs may comprise inputs to other processes and/or control algorithms Data input components comprise elements by which data is input for use by the control and computing hardware components. Such data inputs may comprise positions sensors, motor encoders, as well as manual input elements, such as graphic user interfaces, keyboards, touch screens, microphones, switches, manually-operated scanners, voice-activated input, etc. Data output components may comprise hard drives or other storage media, graphic user interfaces, monitors, printers, indicator lights, or audible signal elements (e.g., buzzer, horn, bell, etc.).

Software comprises instructions stored on non-transitory computer-readable media which, when executed by the control and computing hardware, cause the control and computing hardware to perform one or more automated or semi-automated processes.

While the present disclosure has been described and shown in considerable detail with reference to certain illustrative embodiments, including various combinations and sub-combinations of features, those skilled in the art will readily appreciate other embodiments and variations and modifications thereof as encompassed within the scope of the present disclosure. Moreover, the descriptions of such embodiments, combinations, and sub-combinations is not intended to convey that the disclosure requires features or combinations of features other than those expressly recited in the claims. Accordingly, the present disclosure is deemed to include all modifications and variations encompassed within the spirit and scope of the following appended claims. 

The invention claimed is:
 1. A diagnostic system configured to perform a first nucleic acid amplification reaction and a second nucleic acid amplification reaction different than the first nucleic acid amplification reaction, the diagnostic system comprising: at least one bulk reagent container compartment configured to store at least one first bulk reagent container comprising at least one first bulk reagent for performing sample preparation processes with a first subset and a second subset of a plurality of samples provided to the diagnostic system, and at least one second bulk reagent container comprising a second bulk reagent for performing the first nucleic acid amplification reaction; a unit-dose reagent compartment configured to store at least one unit-dose reagent pack comprising a plurality of unit-dose reagents for performing the second nucleic acid amplification reaction; wherein the diagnostic system is configured to perform the sample preparation process using the at least one first bulk reagent on the first subset and the second subset of the plurality of samples; perform the first nucleic acid amplification reaction using the second bulk reagent on the first subset of the plurality of samples; and perform the second nucleic acid amplification reaction using the plurality of unit-dose reagents on the second subset of the plurality of samples.
 2. The diagnostic system of claim 1, wherein a first module performs the first nucleic acid amplification reaction and a second module performs the second nucleic acid amplification reaction.
 3. The diagnostic system of claim 2, wherein the first module is integral with the second module.
 4. The diagnostic system of claim 2, wherein the second module is configured to be selectively and operably coupled to the first module.
 5. The diagnostic system of claim 4, wherein the at least one bulk reagent container compartment comprises a first bulk reagent container compartment in the first module that is configured to store the at least one first bulk reagent container, and wherein the unit-dose reagent compartment is in the second module.
 6. The diagnostic system of claim 5, wherein the first bulk reagent container compartment stores the at least one first bulk reagent container, and wherein the at least one first bulk reagent comprises a target capture reagent.
 7. The diagnostic system of claim 2, wherein the at least one bulk reagent container compartment comprises a first bulk reagent container compartment in the first module that is configured to store the at least one first bulk reagent container.
 8. The diagnostic system of claim 7, wherein the first bulk reagent container compartment stores the at least one first bulk reagent container, and wherein the at least one first bulk reagent comprises a target capture reagent.
 9. The diagnostic system of claim 7, wherein the at least one bulk reagent container compartment further comprises a second bulk reagent container compartment in the first module that is configured to store the second bulk reagent container.
 10. The diagnostic system of claim 7, wherein the second bulk reagent container compartment stores the second bulk reagent container.
 11. The diagnostic system of claim 7, wherein the at least one bulk reagent container compartment further comprises a second bulk reagent container compartment in the second module that is configured to store a third bulk reagent container comprising a third bulk reagent.
 12. The diagnostic system of claim 11, wherein the third bulk reagent container compartment stores the third bulk reagent container, and wherein the third bulk reagent comprises a reconstitution reagent.
 13. The diagnostic system of claim 1, wherein the unit-dose reagent compartment stores a first unit-dose reagent pack comprising a plurality of first unit-dose reagents for targeting a first nucleic acid, and wherein the unit dose reagent compartment stores a second unit-dose reagent pack comprising a plurality of second unit-dose reagents for targeting a second nucleic acid different than the first nucleic acid.
 14. The diagnostic system of claim 13, wherein the first unit-dose reagents comprise at least one of a polymerase and nucleoside triphosphates for performing the second nucleic acid amplification reaction, and wherein the second unit-dose reagents comprise at least one of a polymerase and nucleoside triphosphates.
 15. The diagnostic system of claim 1, further comprising a distributor configured to move a unit-dose reagent pack stored in the unit-dose reagent compartment to a location accessible to a substance transfer device configured to aspirate a reconstituted form of at least one of the plurality of unit-dose reagents.
 16. The diagnostic system of claim 1, wherein the first nucleic acid amplification reaction is an isothermal reaction, and wherein the second nucleic acid amplification reaction involves temperature cycling.
 17. The diagnostic system of claim 1, wherein the unit-dose reagent compartment stores at least one unit-dose reagent pack comprising a plurality of lyophilized unit-dose reagents.
 18. The diagnostic system of claim 1, wherein the at least one first bulk reagent comprises a magnetically-responsive solid support for directly or indirectly immobilizing a target nucleic acid.
 19. The diagnostic system of claim 1, wherein the at least one first bulk reagent comprises first and second sample processing reagents and wherein the diagnostic system is configured to perform (i) a first sample preparation process using the first sample processing reagent on the first subset of the plurality of samples and (ii) a second sample preparation process using the second sample processing reagent on the second subset of the plurality of samples.
 20. The diagnostic system of claim 1, wherein the diagnostic system is configured to simultaneously perform the first nucleic acid amplification reaction and the second nucleic acid amplification reaction. 